Cleanup src/autofit/ from obsolete and/or experimental code.
This set of patches removes obsolete and experimental features from the src/autofit/ codebase:
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FT_OPTION_AUTOFIT2 was experimental and was actually never compiled in.
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The experimental 'warp' mode never worked properly too, but had a property to enable it, which is removed as well, since there is no point in setting it.
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Remove src/autofit/afangles.* and AF_Angle types, macros and definitions since they are no longer needed (except for a couple functions that are moved to afhints.c)
/cc @apodtele