tmux: also use colors from bubblegum airline theme
don't rely on $SSH_TTY existing upon tmux reattach
add gcM alias to commit using the default message
tmux: add <M-`> to toggle status bar visibility
tig: restore dark foreground on highlighted panels

This change originates from 7afd4f53c89e3abe4d0b160aef676af9d5d6541d.