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Opening up package internals to allow custom fonts/symbols.
- fontSymbol is now public (renamed to FontSymbol).
- newFontSymbol is now public (rename to NewFontSymbol{,Rune}) for allowing the creation of symbols based on an image.
- Added AddFontFamily and AddSymbols to allow for adding custom fonts/symbols to the OCR lookup.
Added second commit with unrelated feature (but depending on the earlier commit that opens up the package). First commit can be merged independently though.