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/DispatcherThread.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "Dispatcher.h"
+
+namespace tt {
+
+/** Starts a Thread to process dispatched messages */
+class DispatcherThread {
+
+    Dispatcher dispatcher;
+    std::unique_ptr<Thread> thread;
+    bool interruptThread = false;
+
+public:
+
+    explicit DispatcherThread(const std::string& threadName, size_t threadStackSize = 4096);
+    ~DispatcherThread();
+
+    /**
+     * Dispatch a message.
+     */
+    void dispatch(Dispatcher::Function function, std::shared_ptr<void> context);
+
+    /** Start the thread (blocking). */
+    void start();
+
+    /** Stop the thread (blocking). */
+    void stop();
+
+    /** Internal method */
+    void _threadMain();
+};
+
+}