implement initial event manager

c_os/user/KeyEventManager.h

@@ -0,0 +1,23 @@
+#ifndef __KeyEventManager_Include_H_
+#define __KeyEventManager_Include_H_
+
+#include "user/KeyEventListener.h"
+
+// NOTE: Could do this more generally but we only have key events
+
+class KeyEventManager {
+private:
+    KeyEventManager(const KeyEventManager& copy) = delete;
+
+    // TODO: Implement some sort of set structure
+    KeyEventListener* listeners[16];  // This is pretty limited but should be enough
+    unsigned int num_subscribed = 0;
+
+public:
+    KeyEventManager() {}
+
+    void subscribe(KeyEventListener& listener);
+    void broadcast(char c); // Unblocks all input waiting threads, I don't have a method to direct input
+};
+
+#endif