The 'open' and 'edit' commands should be configurable

'open' and 'edit' currently use the default system application, but if hooks were provided into this system, they could instead be used to open files using a user-specified application, or even trigger editors to open in JBoss Tools.

Koen, I am asigning this to you because I want your feedback here. If running forge in eclipse, these commands should probably be a no-op, and your eclipse system will simply intercept the output and open/edit the desired file, yes?