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)

TactilityHeadless/Source/TactilityHeadless.cpp

@@ -23,7 +23,7 @@ static Dispatcher mainDispatcher;
 
 static const hal::Configuration* hardwareConfig = nullptr;
 
-static void register_and_start_system_services() {
+static void registerAndStartSystemServices() {
     TT_LOG_I(TAG, "Registering and starting system services");
     addService(service::sdcard::manifest);
     addService(service::wifi::manifest);
@@ -38,7 +38,7 @@ void initHeadless(const hal::Configuration& config) {
     time::init();
     hal::init(config);
     network::ntp::init();
-    register_and_start_system_services();
+    registerAndStartSystemServices();
 }