Many changes: added commandhandler module, macro functions, toggle function and

speed settings. Removed key repetition (no idea why it was there).

firmware/modelinterface.h

@@ -21,6 +21,11 @@ void hardwareInit(void);
  */
 void printMatrix(void);
 
+/**
+ * Toggle-function is called as a command, doesn't have to be implemented.
+ */
+void toggle(void);
+
 /**
  * This tells the current writing speed to the keyboard, for whatever it will
  * do with the value.