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`)

Boards/UnPhone/Source/hal/UnPhoneDisplay.cpp

@@ -1,9 +1,9 @@
 #include "UnPhoneDisplay.h"
 #include "UnPhoneDisplayConstants.h"
 #include "UnPhoneTouch.h"
-#include "Log.h"
+#include <Tactility/Log.h>
 
-#include <TactilityCore.h>
+#include <Tactility/TactilityCore.h>
 
 #include "UnPhoneFeatures.h"
 #include "esp_err.h"