Cyrillic writer & dictionary

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- Add dictionaries for Russian, Ukrainian, Serbo-Croatian
- Enabled Ukrainian and Serbo-Croatian again
- Allow writing characters separate by adding a dot in between (yo=ё, but y.o=ыо)
- Add more shortcuts in a new romanization method called 'ergonomic romanization'. For example: 'jo' and 'yo' both map to 'ё'.