Brian Cain fefb702359
Introduce type and command triggers
This commit introduces some basic functionality for typed triggers:

- command
- action

Command triggers are triggers that will run before or after a given
sub-command.

Action triggers are for running triggers before or after internal
actions for Vagrant. This could be before or after a provision step,
before or after synced folders, or networking, etc.
2019-02-01 13:34:15 -08:00
..
2019-02-01 13:34:15 -08:00