Move the Input classes to src/services/input

The Input classes currently resides in src/components/ogre/input, for historical reasons. The however have no dependencies on Ogre left and should be moved to src/services/input. Previously when we used CVS moving files were cumbersome, but now that we use git it should be easy. After moving them, the scripting bindings needs to be updated, as well as all files that reference the classes. The input service also needs to be started and stopped in Ember.cpp.