Cleanup and improvements (#194)

- Lots of changes for migrating C code to C++
- Improved `Lockable` in several ways like adding `withLock()` (+ tests)
- Improved `Semaphore` a bit for improved readability, and also added some tests
- Upgrade Linux machine in GitHub Actions so that we can compile with a newer GCC
- Simplification of WiFi connection
- Updated funding options
- (and more)

Tactility/Source/app/boot/Boot.cpp

@@ -73,12 +73,8 @@ private:
 #endif
 
         auto* config = tt::getConfiguration();
-        if (config->autoStartAppId) {
-            TT_LOG_I(TAG, "init auto-starting %s", config->autoStartAppId);
-            tt::service::loader::startApp(config->autoStartAppId);
-        } else {
-            app::launcher::start();
-        }
+        assert(!config->launcherAppId.empty());
+        tt::service::loader::startApp(config->launcherAppId);
     }
 
 public: