Add back level unlock shortcut.

Differs from the old implementation in two ways (at least): first, you
it works with "8" rather than "*" because that was easier (Shift-8 will
still work).  Second, the number of digits accepted is scenario
dependent.  It only takes as many digits as are required, e.g. 1 for a
9-level scenario, or 3 for a 100-level scenario.
Remove UTI for Antares plugins.

It seems to disable the rest of the information.
Merge branch 'plugin' into develop
Merge branch 'unlock' into develop