Adds A Config Option To Provide a FontPath Substitution Map #399
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Summary:
In order to A/B test fonts, this adds an option to the
CalligraphyConfig to provide a fontPath substitution map.
This enables dynamically changing fonts at run time and requires
no changes to XML files.
The logic to substitute the fontPath is in the TypefaceUtils.
The reason the map is set on the TypeFaceUtils class instead of the
TypefaceUtils checking the CalligraphyConfig is that this way
it doesn't require constant invocations of CalligraphyConfig.get().
Test Plan: