Updated Polycode templates' Update() to add rendering
ATTENTION: ScreenEntityInstance no longer has a root entity, it is now loaded as children of the ScreenEntityInstance itself. You can now edit the default id, tags and custom properties of the entity itself. Entity tags will now check for duplicate before adding. Fixed numerous crashes relating to entity deletion in the 2d editor. Added a hasResource method to the ResourceManager.
Merge pull request #281 from TheCosmotect/master

Updated Polycode templates' Update() to add rendering
Added asset browser icons for entities and sprites
Made Resources remove themselves from ResourceManager in destructor. Should fix player crashing on quit
Added ability to edit screen entity width and height in the editor. Entities no longer default to 50x50 size in editor, but use the source entity dimensions. Adjusted platformer example to set entity sizes in the editor.
Fixed copy/paste crashing the IDE because of unremoved event listeners
Added a simple Pong game example to IDE Lua examples.
Lua bindings now return pointer class members. Added an equality operator for Lua classes (you can just use == instead of same_c_class now). Updated examples to reflect new changes. UI scroll bars and tree containers will now set cursor to arrow.
A less obtrusive 2D transform gizmo with XY scaling