- fix ellipse line issue
- colored texture paints (optimize text)
- colored alpha texture paints
- unify texture draw code
- GLTextureDraw - correct RGBA handling

- make banded glyphs
- make alpha textures
- alpha atlas
- optimize draw rect

DONE:

- Texture change Rect -> Rectf
- ARC
- DASHER
- circle pen should be able to 'dash'
- arc pen should be able to 'dash'
- polygon pen should be able to 'dash'
