Update gltext.h to remove the black text backgrnd #21
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Added check to make discard alpha pixels and shadow pixels.
When the glyph is created, it automatically comes with a black shadow, as well as a transparent background. This code uses two checks: the first removes the transparent background, and the second removes the black shadow. Adding in a different colored background, and adding options for whether to have a text shadow, should be trivial from here.