[FIX] Remove uses of pc.Vec2/4#data for light cookies. (playcanvas#1405)

Merge pull request playcanvas#1402 from playcanvas/elementinput-options

pc.ElementInput useMouse and useTouch

Fix VAO PR.

Merge branch 'master' of ssh://github.com/playcanvas/engine

Prevent error when spriteAsset is changed before texture atlas load h…

…as completed (playcanvas#1381)

RBG -> RGB (playcanvas#1377)

Fix initialization of buttons (playcanvas#1370)

Fix assigning sprites to elements that have textureassets
Fix assigning textures to elements that have spriteassets
Fix text element event unbinding
Add tests for all of above

Check enabled before loading element assets (playcanvas#1368)

* Check entity is enabled before triggering the load on their assets.
* Clear fontAsset on a text element if font is directly assigned to font property

Missing semi-colon

Linting fixes