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`)

TactilityHeadless/Source/hal/SpiSdCard.cpp

@@ -1,9 +1,8 @@
 #ifdef ESP_PLATFORM
 
-#include "SpiSdCard.h"
+#include "Tactility/hal/SpiSdCard.h"
 
-#include "Check.h"
-#include "Log.h"
+#include <Tactility/Log.h>
 
 #include <driver/gpio.h>
 #include <esp_vfs_fat.h>