[[ 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
Merge remote-tracking branch 'ian/refactor-graphics_performance_tilecache_regions' into feature-graphics_performance_tilecache_regions
Merge branch 'feature-graphics_performance_tilecache_regions' into develop