[API] ImFontGlyphRangesBuilder and fonts example #51
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…fonts configuration with ImFontGlyphRangesBuilder usage. Added font awesome integration example.
SpaiR
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As discussed in #45, this PR adds java reimplementation of ImFontGlyphRangesBuilder from native code. It is a helper to create glyph ranges based on text input. For example, in our project we used it to create font atlas with all characters which are used in game (not only alphabet glyphs, but also some special punctuation symbols ) and allowed our content creators to add these symbols via a separate dictionary txt file which was shared both for in game UI and editors.
I also implemented example of fonts configuration which integrates cyrllic, japanese and Font Awesome icons in imgui's font atlas. Example module now contains FontAwesomeIcons.java file which provides codepoints for all free icons from FA. It is expected that users which want to use these icons in their projects will replicate font setup code and copy this class.
