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)

TactilityCore/Include/Tactility/DispatcherThread.h

@@ -5,11 +5,11 @@
 namespace tt {
 
 /** Starts a Thread to process dispatched messages */
-class DispatcherThread {
+class DispatcherThread final {
 
     Dispatcher dispatcher;
     std::unique_ptr<Thread> thread;
-    bool interruptThread = false;
+    bool interruptThread = true;
 
     int32_t threadMain();
 
@@ -21,13 +21,16 @@ public:
     /**
      * Dispatch a message.
      */
-    void dispatch(Dispatcher::Function function, TickType_t timeout = portMAX_DELAY);
+    bool dispatch(Dispatcher::Function function, TickType_t timeout = portMAX_DELAY);
 
     /** Start the thread (blocking). */
     void start();
 
     /** Stop the thread (blocking). */
     void stop();
+
+    /** @return true of the thread is started */
+    bool isStarted() const { return thread != nullptr && !interruptThread; }
 };
 
 }