enable color emoji support in freetype #1601
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For issue #1600, this PR adds color emoji support.
The only real change required is to add the FT_LOAD_COLOR flag to FT_Load_Glyph.
However this clashes with the no_bitmap flag, so selectively have to remove that when detecting a bitmap font. Also, for bitmap fonts, FreeType requires a call to select the size (for now we always select size 0, I have yet to find a bitmap font in TTF format with multiple sizes). Finally, our pixel copy functions needed to be made aware of FT sometimes using a 32-bit instead of 8-bit source bitmap format.
I also added an example font with color emoji (selection of some NotoColorEmoji glyphs), with appropriate license notice. And an example to use that font.