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`)

TactilityCore/Include/Tactility/EventFlag.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include "RtosCompatEventGroups.h"
+#include <memory>
+
+namespace tt {
+
+/**
+ * Wrapper for FreeRTOS xEventGroup.
+ */
+class EventFlag {
+private:
+
+    struct EventGroupHandleDeleter {
+        void operator()(EventGroupHandle_t handleToDelete) {
+            vEventGroupDelete(handleToDelete);
+        }
+    };
+
+    std::unique_ptr<std::remove_pointer_t<EventGroupHandle_t>, EventGroupHandleDeleter> handle;
+
+public:
+
+    EventFlag();
+    ~EventFlag();
+
+    enum Flag {
+        WaitAny = 0x00000000U, ///< Wait for any flag (default).
+        WaitAll = 0x00000001U, ///< Wait for all flags.
+        NoClear = 0x00000002U, ///< Do not clear flags which have been specified to wait for.
+
+        Error = 0x80000000U,          ///< Error indicator.
+        ErrorUnknown = 0xFFFFFFFFU,   ///< TtStatusError (-1).
+        ErrorTimeout = 0xFFFFFFFEU,   ///< TtStatusErrorTimeout (-2).
+        ErrorResource = 0xFFFFFFFDU,  ///< TtStatusErrorResource (-3).
+        ErrorParameter = 0xFFFFFFFCU, ///< TtStatusErrorParameter (-4).
+        ErrorISR = 0xFFFFFFFAU,       ///< TtStatusErrorISR (-6).
+    };
+
+    uint32_t set(uint32_t flags) const;
+    uint32_t clear(uint32_t flags) const;
+    uint32_t get() const;
+    uint32_t wait(
+        uint32_t flags,
+        uint32_t options = WaitAny,
+        uint32_t timeout = (uint32_t)portMAX_DELAY
+    ) const;
+};
+
+} // namespace