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/app/gpio/Gpio.cpp

@@ -1,11 +1,11 @@
-#include "Mutex.h"
-#include "Thread.h"
-#include "service/loader/Loader.h"
-#include "lvgl/Toolbar.h"
+#include "Tactility/service/loader/Loader.h"
+#include "Tactility/lvgl/Toolbar.h"
 
-#include "GpioHal.h"
-#include "lvgl/LvglSync.h"
-#include "Timer.h"
+#include <Tactility/app/gpio/GpioHal.h>
+#include <Tactility/lvgl/LvglSync.h>
+#include <Tactility/Mutex.h>
+#include <Tactility/Thread.h>
+#include <Tactility/Timer.h>
 
 namespace tt::app::gpio {