Merge develop into main (#313)

- Add app path get() functions to `TactilityC`
- Improved `Dispatcher` and `DispatcherThread`
- Improved `PubSub` (type safety)
- Created test for `DispatcherThread` and `PubSub`
- Save properties files on app exit (various apps) by posting it to the main dispatcher (fixes UI hanging briefly on app exit)
- Fixed bug with `SystemSettings` being read from the wrong file path.
- `loadPropertiesFile()` now uses `file::readLines()` instead of doing that manually
- Increased timer task stack size (required due to issues when reading a properties file for the very first time)
- General cleanup
- Created `EstimatedPower` driver that uses an ADC pin to measure voltage and estimate the battery charge that is left.
- Cleanup of T-Deck board (updated to new style)

Boards/LilygoTdeck/Source/devices/TdeckKeyboard.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <Tactility/hal/keyboard/KeyboardDevice.h>
+#include <Tactility/TactilityCore.h>
+
+class TdeckKeyboard final : public tt::hal::keyboard::KeyboardDevice {
+
+    lv_indev_t* _Nullable deviceHandle = nullptr;
+
+public:
+
+    std::string getName() const override { return "T-Deck Keyboard"; }
+    std::string getDescription() const override { return "I2C keyboard"; }
+
+    bool startLvgl(lv_display_t* display) override;
+    bool stopLvgl() override;
+    bool isAttached() const override;
+    lv_indev_t* _Nullable getLvglIndev() override { return deviceHandle; }
+};