Allways use KeyMapResolver to find keymap name.

Normal mode will thus use NO_KEYMAP for f/t as its buildKeyMapResolver
function gets that passed in from getKeyMapsForMotions() in
CommandBasedMode.

Fixes #411.
Reimplement omap keymap resolving.

There was no state-based keymap resolving for omap yet, so add all
states for operators to the buildKeyMapResolver methods.
Add tests for remapping.

Some have their status ignored because they need some work elsewhere.