Restructured files and folders.

Assets/MA_ToolBox/MA_Utilities/EditorUtils/MA_EditorGridUtils.cs

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+//https://github.com/maxartz15/MA_EditorUtils
+
+#if UNITY_EDITOR
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEditor;
+
+namespace MA_Editor.Grid
+{
+	public static class Grid
+	{
+		public static void DrawGrid(Rect editorWorkRect, float gridSpacing, Color gridColor)
+		{
+			//Process grid spacing values
+			int widthDivs = Mathf.CeilToInt(editorWorkRect.width / gridSpacing);
+			int heightDivs = Mathf.CeilToInt(editorWorkRect.height / gridSpacing);
+
+			//Using handles
+			Handles.BeginGUI();
+			Handles.color = gridColor;
+
+			for (int x = 0; x < widthDivs; x++)
+			{
+				Handles.DrawLine(new Vector3(gridSpacing * x, 0, 0), new Vector3(gridSpacing * x, editorWorkRect.height, 0));
+			}
+
+			for (int y = 0; y < heightDivs; y++)
+			{
+				Handles.DrawLine(new Vector3(0, gridSpacing * y, 0), new Vector3(editorWorkRect.width, gridSpacing * y, 0));
+			}
+
+			Handles.color = Color.white;
+			Handles.EndGUI();
+		}
+
+		public static void DrawZoomableGrid(Rect editorWorkRect, float gridSpacing, Color gridColor, Vector2 zoomCoordsOrigin)
+		{
+			//Process grid spacing values
+			int widthDivs = Mathf.CeilToInt(editorWorkRect.width / gridSpacing);
+			int heightDivs = Mathf.CeilToInt(editorWorkRect.height / gridSpacing);
+
+			//Using handles
+			Handles.BeginGUI();
+			Handles.color = gridColor;
+
+			for (int x = 1; x < widthDivs; x++)
+			{
+				Handles.DrawLine(new Vector3(gridSpacing * x - zoomCoordsOrigin.x, -zoomCoordsOrigin.y, 0), new Vector3(gridSpacing * x - zoomCoordsOrigin.x, editorWorkRect.height - zoomCoordsOrigin.y, 0));
+			}
+
+			for (int y = 1; y < heightDivs; y++)
+			{
+				Handles.DrawLine(new Vector3(-zoomCoordsOrigin.x, gridSpacing * y - zoomCoordsOrigin.y, 0), new Vector3(editorWorkRect.width - zoomCoordsOrigin.x, gridSpacing * y - zoomCoordsOrigin.y, 0));
+			}
+
+			Handles.color = Color.white;
+			Handles.EndGUI();
+		}
+	}
+}
+#endif

Assets/MA_ToolBox/MA_Utilities/EditorUtils/MA_EditorGridUtils.cs.meta

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+fileFormatVersion: 2
+guid: 64df885d83caddf48acfa78533a3e76f
+timeCreated: 1522672827
+licenseType: Free
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
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Assets/MA_ToolBox/MA_Utilities/EditorUtils/MA_EditorRectUtils.cs

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+//https://github.com/maxartz15/MA_EditorUtils
+
+//References:
+//http://martinecker.com/martincodes/unity-editor-window-zooming/
+
+#if UNITY_EDITOR
+using UnityEngine;
+using MA_Editor;
+
+namespace MA_Editor.RectUtils
+{
+	public static class RectUtils
+	{
+		//Start			http://martinecker.com/martincodes/unity-editor-window-zooming/
+		public static Vector2 TopLeft(this Rect rect)
+		{
+			return new Vector2(rect.xMin, rect.yMin);
+		}
+
+		public static Rect ScaleSizeBy(this Rect rect, float scale)
+		{
+			return rect.ScaleSizeBy(scale, rect.center);
+		}
+
+		public static Rect ScaleSizeBy(this Rect rect, float scale, Vector2 pivotPoint)
+		{
+			Rect result = rect;
+			result.x -= pivotPoint.x;
+			result.y -= pivotPoint.y;
+			result.xMin *= scale;
+			result.xMax *= scale;
+			result.yMin *= scale;
+			result.yMax *= scale;
+			result.x += pivotPoint.x;
+			result.y += pivotPoint.y;
+			return result;
+		}
+
+		public static Rect ScaleSizeBy(this Rect rect, Vector2 scale)
+		{
+			return rect.ScaleSizeBy(scale, rect.center);
+		}
+		
+		public static Rect ScaleSizeBy(this Rect rect, Vector2 scale, Vector2 pivotPoint)
+		{
+			Rect result = rect;
+			result.x -= pivotPoint.x;
+			result.y -= pivotPoint.y;
+			result.xMin *= scale.x;
+			result.xMax *= scale.x;
+			result.yMin *= scale.y;
+			result.yMax *= scale.y;
+			result.x += pivotPoint.x;
+			result.y += pivotPoint.y;
+			return result;
+		}
+		//End			http://martinecker.com/martincodes/unity-editor-window-zooming/
+
+		public static Rect MultiplyRectSize(Rect rect, float amount)
+		{
+			Rect multipliedRect = new Rect(rect.x, rect.y, rect.width * amount, rect.height * amount);
+			return multipliedRect;
+		}
+
+		public static Rect MultiplyRectSizeAndCenter(Rect rect, float amount)
+		{
+			Rect multipliedRect = new Rect(rect.x, rect.y, rect.width * amount, rect.height * amount);
+			multipliedRect.x = -(multipliedRect.width / 2);
+			multipliedRect.y = -(multipliedRect.height / 2);
+			return multipliedRect;
+		}
+	}
+}
+#endif

Assets/MA_ToolBox/MA_Utilities/EditorUtils/MA_EditorRectUtils.cs.meta

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+guid: 1ec1c2403bd92a84798e0ad68ebf4bad
+timeCreated: 1522671138
+licenseType: Free
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
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Assets/MA_ToolBox/MA_Utilities/EditorUtils/MA_EditorZoomUtils.cs

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+//https://github.com/maxartz15/MA_EditorUtils
+
+//References:
+//http://martinecker.com/martincodes/unity-editor-window-zooming/
+
+#if UNITY_EDITOR
+using UnityEngine;
+using MA_Editor;
+using MA_Editor.RectUtils;
+
+namespace MA_Editor.GUILayoutZoom
+{
+	//http://martinecker.com/martincodes/unity-editor-window-zooming/
+	public class GUILayoutZoom
+	{
+		private const float EditorWindowTabHeight = 21.0f; //The height of the editor window top bar. (were the name, zoom and exit buttons are)
+		private static Matrix4x4 prevGuiMatrix;
+
+		public static Rect BeginArea(float zoomScale, Rect screenCoordsArea)
+		{
+			GUI.EndGroup();        // End the group Unity begins automatically for an EditorWindow to clip out the window tab. This allows us to draw outside of the size of the EditorWindow.
+
+			Rect clippedArea = screenCoordsArea.ScaleSizeBy(1.0f / zoomScale, screenCoordsArea.TopLeft());
+			clippedArea.y += EditorWindowTabHeight;
+			GUI.BeginGroup(clippedArea);
+
+			prevGuiMatrix = GUI.matrix;
+			Matrix4x4 translation = Matrix4x4.TRS(clippedArea.TopLeft(), Quaternion.identity, Vector3.one);
+			Matrix4x4 scale = Matrix4x4.Scale(new Vector3(zoomScale, zoomScale, 1.0f));
+			GUI.matrix = translation * scale * translation.inverse * GUI.matrix;
+
+			return clippedArea;
+		}
+
+		public static void EndArea()
+		{
+			GUI.matrix = prevGuiMatrix;
+			GUI.EndGroup();
+			GUI.BeginGroup(new Rect(0.0f, EditorWindowTabHeight, Screen.width, Screen.height));
+		}
+	}
+}
+#endif

Assets/MA_ToolBox/MA_Utilities/EditorUtils/MA_EditorZoomUtils.cs.meta

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+timeCreated: 1522669939
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