Added support for Polish OLED characters.
- Custom FONT_SMALL ArialMT_Plain_10_PL
- Automatic selection between Polish and Ukrainian/Russian characters mapping depending on the -D OLED_{LANG_NAME} flage
* Move static functions into Screen.h, show compass during calibration
* Move to _fontHeight macro to avoid collision
* Move some alert functions to new alert handler
* Catch missed reboot code
* ESP32 fixes
* Bump esp8266-oled-ssd1306
* Fixes for when a device has no screen
* Use new startAlert(char*) helper class
* Add EINK bits back to alert handling
* Add noop class for no-display devices
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Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
