Add columns format to git-state

[Brickster]

$ git state --format columns                                            
# status (master...origin/master)                                       # log
                                                                            
    nothing to commit, working directory is clean                           b2a20c3 Fix printing dry run message during a no-op
                                                                            0c2cb43 Add missing issue tests
                                                                            34b7c95 Fix associating detached HEADs
# branches                                                                  7c02902 Fix associating with an invalid revision
                                                                            fc92316 Fix viewing changes when HEAD is detached
    * master b2a20c3 [origin/master] Fix printing dry run message...        c63408b Fix requirement syntax
                                                                            3b56aba Fix pruning new repositories
# stashes                                                                   4298100 Fix pruning with no associations
                                                                            924a1fa Fix changes unassociate with no association
    74999b7 refs/stash@{0}: WIP on master: fc92316 Fix viewing ch...        b2019ae Fix PEP8 issues
    501cd80 refs/stash@{1}: WIP on master: b2019ae Fix PEP8 issue...
    3a01884 refs/stash@{2}: On master: state func tests
    6fdf1cc refs/stash@{3}: On master: first pass state.color
    5e55e8d refs/stash@{4}: WIP on master: 3434e26 Update depende...

Not sure how they plan to flow properly given there is no guarantee on the output size in either direction.