Relocate 'input' folder.

src/input/InputBroker.h

@@ -0,0 +1,22 @@
+#pragma once
+#include "Observer.h"
+
+typedef struct _InputEvent {
+    const char* source;
+    char inputEvent;
+} InputEvent;
+class InputBroker :
+    public Observable<const InputEvent *>
+{
+    CallbackObserver<InputBroker, const InputEvent *> inputEventObserver =
+        CallbackObserver<InputBroker, const InputEvent *>(this, &InputBroker::handleInputEvent);
+
+  public:
+    InputBroker();
+    void registerSource(Observable<const InputEvent *> *source);
+
+  protected:
+    int handleInputEvent(const InputEvent *event);
+};
+
+extern InputBroker *inputBroker;