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)

TactilityCore/Source/Log.h

@@ -1,6 +1,8 @@
 #pragma once
 
 #include "LogMessages.h"
+#include <array>
+#include <memory>
 
 #ifdef ESP_PLATFORM
 #include <esp_log.h>
@@ -38,7 +40,7 @@ struct LogEntry {
  * The array size is TT_LOG_ENTRY_COUNT
  * @param[out] outIndex the write index for the next log entry.
  */
-LogEntry* copyLogEntries(unsigned int& outIndex);
+std::unique_ptr<std::array<LogEntry, TT_LOG_ENTRY_COUNT>> copyLogEntries(std::size_t& outIndex);
 
 } // namespace tt