Project restructuring (fixes macOS builds) (#198)

- Create `Include/` folder for all main projects
- Fix some issues here and there (found while moving things)
- All includes are now in `Tactility/` subfolder and must be included with that prefix. This fixes issues with clashing POSIX headers (e.g. `<semaphore.h>` versus Tactility's `Semaphore.h`)

TactilityHeadless/Source/service/wifi/WifiSettingsMock.cpp

@@ -1,7 +1,6 @@
 #ifndef ESP_PLATFORM
 
-#include "WifiSettings.h"
-#include "Log.h"
+#include "Tactility/service/wifi/WifiSettings.h"
 
 namespace tt::service::wifi::settings {