Transfers possession of keyboard mappings from the Mac side over to individual machines.

Specifically by establishing an intermediate representation of a useful mix between the American and British IBM and Mac keyboard layouts, and routing through that.

Machines/KeyboardMachine.cpp

@@ -0,0 +1,29 @@
+//
+//  KeyboardMachine.cpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 10/10/2017.
+//  Copyright © 2017 Thomas Harte. All rights reserved.
+//
+
+#include "KeyboardMachine.hpp"
+
+using namespace KeyboardMachine;
+
+Machine::Machine() {
+	keyboard_.set_delegate(this);
+}
+
+void Machine::keyboard_did_change_key(Inputs::Keyboard *keyboard, Inputs::Keyboard::Key key, bool is_pressed) {
+	uint16_t mapped_key = get_keyboard_mapper().mapped_key_for_key(key);
+	if(mapped_key != KeyNotMapped) set_key_state(mapped_key, is_pressed);
+}
+
+void Machine::reset_all_keys() {
+	// TODO: unify naming.
+	clear_all_keys();
+}
+
+Inputs::Keyboard &Machine::get_keyboard() {
+	return keyboard_;
+}