Pagination for source command

[Exper1mental]

Pretty self-explanatory. Add pagination for the !source list and !source print <file-name> commands. This way the commands won't drown any conversations in the massive wall of file indices.

[Jay-Madden]

Hmm, pagination for source print wouldn't make much sense, you lose too much contextual info. You can already print out a range of lines so that should be used.

As for source list that's an interesting idea. I'm not opposed and would like to hear some other peoples thoughts on it