**Fonts**
Dynamically load text and icon fonts when the device boots.
Font bitdepth depends on whether the device is an ESP32 one and whether it has external RAM available.
When no external RAM is available on ESP32, only small and medium font variants are generated; large font variants refer to the medium size ones.
Implemented Appearance settings app for changing font and font size.
**Other changes**
- Added keyboard shortcuts to delete or rename files in directory views.
- Improved app-grid tile sizing to provide more room for labels.
- Reduced the default LED strip brightness.
Graphics & rendering
- Implement `binfont-module` to generate bitmap fonts on the device itself
- Remove lodepng support from LVGL library and create `Modules/lodepng-module` to make the feature re-usable in non-LVGL apps too. Add binding functions for LVGL support.
- Implement large icons for boot screen (Tactility and USB logos)
- Remove unused asset files in `Data/`
Boot
- Split up `Tactility.cpp` and its `run()` function into various `Init*.cpp` files.
- Re-implement `Boot.cpp` app as non-LVGL app
- Boot app now has a `BootSequence.cpp` for the init code.
- LVGL is now started when the Boot app finishes
- Move more init logic into Boot app
BLE
- Don't allocate scan result buffers unless BLE is on
- Allocate scan results in external memory if possible
UX & UI
- USB Settings app: remove border from the button container
