add background alpha property to gltransformation

[John Ludwig]

I’d like to be able to control the default background alpha in gltransformation, in particular i’d like to emit textures with transparent backgrounds.  I’d suggest adding a property to control the background alpha, and then replacing the alpha arg in the clear color call in gltransformation.c:600 with this property value.  Is this something that would be generally useful?

--------------------------------
John Ludwig
jhludwig at surround.io
john at theludwigs.com
@jhludwig
www.surround.io
www.theludwigs.com
4259227055
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