Add vim-specific interactions to command

This mostly adds the commonly requested set (:wq and friends) and
a few that I use frequently
:<line> to go to a line number
:vsp / :sp to create a split
:cn / :cp to go to diagnostics
ea3a1745f5Conrad Irwin committed on 9/21/2023, 2:44:26 AMparentd42093e
7 files changedLine totals unavailable