CoreS3 refactored & remove M5 libraries (#143)

Remove dependencies M5Unified and M5GFX because:
- Sometimes the release doesn't even compile
- The amount of functions is too close to the limit (I recently had to remove some code/dependency to be able to make a build at all)
- Graphics performance issue since last update
- Touch screen performance issues (not perfect yet, but better)
- Compatibility issues with Tactility SPI/I2C versus M5Unified/M5GFX variants.

Documentation/ideas.md

@@ -10,6 +10,8 @@
   - Add statusbar icon for memory pressure.
   - Show error in WiFi screen (e.g. AlertDialog when SPI is not enabled and available memory is below a certain amount)
 - Clean up static_cast when casting to base class.
+- M5Stack CoreS3 SD card mounts, but cannot be read. There is currently a notice about it [here](https://github.com/espressif/esp-bsp/blob/master/bsp/m5stack_core_s3/README.md).
+- hal::I2c has inconsistent return values for read/write functions
 
 # TODOs
 - Call tt::lvgl::isSyncSet after HAL init and show error (and crash?) when it is not set.