Version 1.5.4

- added support for GDEQ031T10 3.1" b/w 240x320
- updated support for GDEY075T7 7.5" b/w 800x480
- renamed driver class GxEPD2_750_YT7 to GxEPD2_750_GDEY075T7
- the actual GDEY075T7 panels have fast full refresh capability
- added support for Waveshare 7.3" 7-color, driver class GxEPD2_730c_ACeP_730
- added support for Waveshare 7.3" 7-color PhotoPainter with RPi Pico RP2040
- updated b/w driver classes for SSD controllers
- updated 7-color driver classes (design cleanup)