FakeVim: Added helper functions

Change-Id: I01ac58625370b7f01b9b87a15afbf6c32549e6f8
Reviewed-by: hjk <hjk121@nokiamail.com>
FakeVim: Test some sub-modes in functions

Change-Id: Ia5434b0e3dc56ad1657b5113279f8656c27ccfa7
Reviewed-by: hjk <hjk121@nokiamail.com>
FakeVim: Handle more commands as aliases

Change-Id: Id7eb81ccb87b89c4c164119147b2d854d2fca9d4
Reviewed-by: hjk <hjk121@nokiamail.com>