oval points
oval radius is min(width, height)
Merge branch 'master' of https://github.com/runrev/livecode into oval_points

Conflicts:
	prebuilt
code cleanup
[[ Bugfix ]] Fix crash in MCObject::sendmessage()
[[ GraphicsPerformance ]] Clip to only damaged tiles when updating the tilecache
[[ GraphicsPerformance ]] Free the tile clip region after use
[[ GraphicsPerformance ]] Clip to only damaged tiles when updating tilecache sprites
360 degree ovals
single-quadrant wedges are working
quadrants 2,3,4 working
finally... roundrects, ovals, startAngle, arcAngle
[[ ThreadedRendering ]] Implemented pthread thread pool.
[[ ThreadedRendering ]] Split mac redraws into 4 tiles, each of which is rendered in it's own thread.
[[ ThreadedRendering ]] Initial implementation of windows thread pool.
[[ ThreadedRendering ]] Initial implementation of iOS, Linux and Android threaded rendering.
[[ ThreadedRendering ]] Updated stack tile creation and rendering to platform indapendent level.
[[ ThreadedRendering ]] Put locks around stack id cache access.
[[ ThreadedRendering ]] Fixed minor bug in legacy gradients.
Update docs for revBrowser
[[ Bug 12131 ]] Explicitly set window frame in case content is on secondary screen
[[ Bug 12894 ]] Add centerRect and iconGravity to image properties
[[ Bug 12892 ]] Fix rgb swap on iOS when premultiplying image data
[[ Bug 12891 ]] Make sure we use 1.5 version class files.