Support `$bumpframe` animated normal

[kristiker]

I think animation parameters in complex and others work on the whole material (so all the maps). S1import currently only supports $frame (albedo).

source1import/utils/dev/.todo.txt

Lines 52 to 63 in 43d1009

	animatedtexture
	{
	animatedtexturevar "$normalmap"
	animatedtextureframenumvar "$bumpframe"
	animatedtextureframerate "30.0"
	}
	texturescroll
	{
	texturescrollvar "$bumptransform"
	texturescrollrate "0.05"
	texturescrollangle "45.0"
	}