Refactored for teensy 4.0, xEvi hardware

- Switched to platformio, ino -> cpp
- MPRLS for pressure sensor
- Added basic ICM support
- Removed widi, battery, other features not supported in xEvi
- Removed legacy options/processing
- Added LED strip support
- Added encoder support
- Reworked menu code to use encoders/be more flexible

.gitmodules

@@ -1,4 +1,4 @@
-[submodule "simulation/imgui"]
-	path = simulation/imgui
-	url = https://github.com/ocornut/imgui.git
-	ignore = untracked
+[submodule "simulation/imgui"]
+	path = simulation/imgui
+	url = https://github.com/ocornut/imgui.git
+	ignore = untracked