SWORD25: Optimize graphics drawing code
SWORD25: Change absolute Z calculation to match that of absolute x/y; remove old comment
Merge branch 'master' of github.com:scummvm/scummvm into sword25-gfx
SWORD25: Fix blitting code
- Rename collectRenderQueue to preRender
- Only do forceRefresh() in Panel::setColor() and Text::setText() if the new values are different
- Move child object resorting from RenderObject::render() into RenderObject::preRender()
Merge pull request #320 from johndoe123/sword25-gfx

SWORD25: Optimized graphics drawing