`evil-define-key' like `vimpulse-define-key'
In vimpulse I could define a key for a mode that is not already loaded.
Now I have to use `evil-define-key' on a real keymap, i.e. the keymap must already be defined and thus the file loaded.
This leaves me with either use a mode-hook use eval-after-load.
Both are not really satisfying.