Apply `ENABLED` / `DISABLED` macros to language-related files.

Automatic selection was to unflexible.

Updated documentation

Updated language files to new logic and documentation.

Updated bdf2u8g.exe

Top -> down
- Decide what output function is to use.
- Precautions. If non of the DISPLAY_CHARSET_HD44780's is selected fall back to Japanese.
- When we are not on the dogms setup a mapping table depending on display type and mapper.
- If we are on dogm we use ONE To ONE mapping - except kanji.
- select and define one of the mapping functions.