unPhone implementation and more (#169)

- Implemented [unPhone](https://unphone.net/) v9 board
- Updated `.clang-format` to better reflect the intended code style
- Fix SD card compatibility issues for all boards (frequency wasn't set well)
- Moved `I2cDevice` class from CoreS3 board project to TactilityHeadless project
- Tactility configuration now has default empty lists for apps and services fields
- Fix for Launcher app: we don't need padding when showing it vertically
- Fix for I2cDevice read/write calls that checked for `esp_err_t` instead of `bool`
- Fix for TinyUSB init that checked for `esp_err_t` instead of `bool`

CODING_STYLE.md

@@ -2,7 +2,9 @@
 
 The basic formatting rules are set in `.clang-format`. Use auto-formatting in your editor.
 
-All code should target C++ language revision 17.
+All code should target C++ language revision 20.
+
+If you use CLion, please enable the setting called "Enable ClangFormat" under Settings > Editor > Code Style.
 
 ## Naming
 
@@ -81,3 +83,7 @@ enum class  {
     Error
 };
 ```
+
+### Exceptions
+
+Don't ever throw them. Make a return type that wraps all the error and success scenarios that are relevant.