removing some serious inefficiencies, fixing a change that broke compatibility with opengl < 3#44

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Commits on Sep 18, 2014

removing completely insane and purposeless 64x horizontal scaling which is then reversed by a custom transform matrix. What were you thinking??
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Avoiding unloading the Freetype library and typeface during texture_font_load_glyphs() only to immediately load it again to calculate the kerning.
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adding optional GL_ALPHA format as an alternative to the newly added GL_RED
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adding brief documentation to the defines used in texture_atlas_upload
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tweaking preprocessor defines to toggle between GL_ALPHA and GL_RED formats for single channel rendering
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adding control to enable suppression of horizontal hinting, and separating its define from that of horizontal resolution to avoid confusion and increase configurability
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