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/timedatesettings/TimeDateSettings.cpp

@@ -1,11 +1,11 @@
-#include <StringUtils.h>
-#include "lvgl.h"
-#include "lvgl/Toolbar.h"
-#include "service/loader/Loader.h"
-#include "app/timezone/TimeZone.h"
-#include "Assets.h"
-#include "time/Time.h"
-#include "lvgl/LvglSync.h"
+#include "Tactility/app/timezone/TimeZone.h"
+#include "Tactility/lvgl/Toolbar.h"
+#include "Tactility/service/loader/Loader.h"
+#include "Tactility/lvgl/LvglSync.h"
+
+#include <Tactility/Assets.h>
+#include <Tactility/time/Time.h>
+#include <lvgl.h>
 
 #define TAG "text_viewer"