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`)

Tactility/Source/service/gui/Keyboard.cpp

@@ -1,8 +1,9 @@
-#include "Check.h"
-#include "TactilityConfig.h"
-#include "service/gui/Gui_i.h"
-#include "lvgl/LvglKeypad.h"
-#include "lvgl/LvglSync.h"
+#include "Tactility/Check.h"
+#include "Tactility/service/gui/Gui_i.h"
+#include "Tactility/lvgl/LvglKeypad.h"
+#include "Tactility/lvgl/LvglSync.h"
+
+#include <Tactility/TactilityConfig.h>
 
 namespace tt::service::gui {