[[ RefactorGraphics ]] use libgraphics pixel packing routines to export / import bitmap effect colors in standard form
[[ RefactorGraphics ]] Factor out frame-loading implementation from MCCachedImageRep to new MCLoadableImageRep class
[[ RefactorGraphics ]] Change MCCachedImageRep list to be searchable by key string
[[ FullscreenMode ]] MCImage class now fetches image frames based on the current device scale.
[[ FullscreenMode ]] Added MCDensityMappedImageRep to retain references to density-mapped image sets - removed implementation details from MCImage class
[[ FullscreenMode ]] Factored out image loading implementation from MCCachedImageRep and made cache search more general
[[ FullscreenMode ]] Factored out MCStack::resolve_relative_path() method to support finding files for density-mapped image sets
[[ FullscreenMode ]] Added density param to MCImageRep::LockImageFrame & density field to MCImageFrame to request & receive frames at different scales
Merge branch 'develop' of https://github.com/runrev/livecode into develop