Initial editor commit

- Add Entity Tree View used to select entities to be modified
- Add Entity View used to Add/Remove/Edit Components of the Entity
- Add Asset View which lists all available assets

CopiumEngine/assets/fileicon.meta

@@ -0,0 +1,4 @@
+[Texture2D]
+filepath=res/textures/FileIcon.png
+mag-filter=linear
+uuid=e2c32c71-e694-91a9-87dc-8162eda5b7c7