Chained cmds

[mattscamp]

This is a start to chained commands in overlay mode. Right now it supports a chained save and exit ("wq") and jumping lines(directly calling the #, e.g. "25").

Ref: #122 #123

Known bugs right now:

• Non existent commands entered just freeze up the editor
• If trying to jump to a non existent line, it will crash the editor

[mattscamp]

@gchp Looks like this commit broke something: def8d77

[gchp]

@mattscamp yep, I forgot to commit some stuff. Could you rebase this and see if it builds?

[mattscamp]

Sure, looks like it's failing for a new reason now. @gchp