Get secrets for level

[liam-mitchell]

'secrets for S-A-00-00' and such, returning '[!!] G++T++' (or whatever!). This is available in the level files.

[liam-mitchell]

Probably shouldn't let people do this in channel so as to avoid spoilers.

[edelkas]

Late update for anyone following progress in this fork:
Addressed in edelkas@2249dcf and edelkas@731798e on 21 Sep 2021