Refactor the ST7789_display usermod into a more generic TFT_display usermod

[axlan]

Changes

• Renamed usermod to TFT_display
• Bug fixes (problems checking if redraw needed, mistake in appendConfigData pin indexing, etc.)
• Made indentation consistent 2 spaces
• Added warning for RO config options
• Moved USERMOD_ID_TFT_DISPLAY to const.h
• Made rotation and font size configuration options
• Added additional build macros to make supporting other displays easier
• Updated documentation for supporting generic displays
• Added platformio_override.sample.ini for targeting T-QT Pro dev board

[blazoncek]

Please check ST7789_display usermod and possibly combine the two.

The container modification should be separate PR.

[axlan]

@blazoncek OK, I switched this PR to refactor the existing ST7789_display.

[softhack007]

axlan force-pushed the tft-usermod branch from 427dac5 to e1dd03f 53 minutes ago

@axlan please don't force-push while you have a PR open. It leads to weird side effects in the main WLED github, like lost review comments, broken links, re-opened issue tickets etc.

[blazoncek]

Force pushing has become a bad habit with a lot of contributors lately. I will start closing such PRs regardless of their value as I really don't have the time to review such mess.

Please see how to properly submit a PR.