Refactor keyboard processor initialisation code.

Turn the keyboard class backing the km_kbp_keyboard and km_kbp_keyboard_attr objects into just keyboard_attributes.
Move the abstract_processor and sublcasses as the objects that back km_kbp_keyboard and make keyboard_attrs a member of the asbtract_processor.
Move kmx_processor and mock_processor declarations into their own headers.
Make all vector<km_kbp_option_item> into vector<option> to handle memory management, moving and copying correctly.
Update test cases accordingly