Add command to end dry run mode

[splewis]

Originally requested in #104:

End dry run - If possible I would ask a command ".enddry" or ".enddryrun" or something similar that ends the dryrun setting back up the previous options that have been turned off.

[cwwwipsy]

Yeah, this would be nice!

[Jasperhino]

having the same problem, not being able to end a dry run. .map is the current not that beautiful workaround i guess

[cwwwipsy]

Here's what I do, I type .setup and Exit the Practice Mode, then .prac to bring it back. Less convenient; but, it works.