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`)

TactilityC/Source/tt_bundle.cpp

@@ -1,6 +1,6 @@
-#include <cstring>
 #include "tt_bundle.h"
-#include "Bundle.h"
+#include <Tactility/Bundle.h>
+#include <cstring>
 
 #define HANDLE_AS_BUNDLE(handle) ((tt::Bundle*)(handle))