Add support for clearing the count repetitions by pressing Esc

Moved the check for pressing Esc to before where the command event keys are processed - and it will clear out the number of repetitions entered.

This was going to be part of implementing F and f as commands: Both of which require you to be able to enter addtional characters after the command.  

First pass didn't work so well, so here is just the escape part.
Let's put this in `func (*m normalMode) Reset()` and also call that at L231