vslsmas: Support RGB24 planar format for output.
vslsmas: Support RGB48 planar format for output.
vslsmas: Simplify packed BGR48 -> planar RGB48 conversion a bit.
lsmashinput: Use av_image_alloc to simplify the codes of colorspace conversions.
lsmashsource: Use av_image_alloc to simplify the codes of frame maker.
vslsmash: Use av_image_alloc to simplify the codes of frame maker.
vslsmas: Remove nonsense error messages.
lsmashinput: Add null pointer check on extended_data.
lsmashsource: Add null pointer check on extended_data.
lsmashmuxer: Change the order of tab stop.
Merge branch 'plain' into build-msvc

Merge revision: r395
Conflicts:
	AviUtl/colorspace.c
	VapourSynth/video_output.c