fix RenderTexture stage flipping
removed `childIndex`
Fixed empty slots handling (#220); Fixed scaled slots handling (#205)
consider points on the edge 'inside'
Merge pull request #212 from namuol/dev

fix RenderTexture stage flipping
childIndex removed
fixes #234
Merge pull request #229 from GorshSerginio/dev

Fixed empty slots handling (#220); Fixed scaled slots handling (#205)
fixes DestroyTexture
Removed unused js inports in example 12 index
fixed graphics fill alpha bug

Fixed issue where if beginfill alpha was set to 0 it would be stored as
1.
merged upstream/dev