Extract licensing information to show in the version output.

[nightowl286]

There should be a setting for including the licensing information of the program, and a setting for whether this should be shown in the version output.

It might also be useful to add settings for a --license flag and a license command for displaying this information.

Potential problems:

• Is it possible for me to extract the licensing information from the assembly information or will the user be forced to manually specify it?