support searching in line by line panel
move mutexes into their own struct
add line by line panel mutex
apply LBL panel mutex
bump gocui to prevent crashing when search item count decreases
This keybinding has been more pain than it's worth. Having a tab keybinding
to cycle tabs implies that you can shift+tab and when you shift+tab the
application exits because termbox, our dependency, doesn't know how to
interpret the escape sequence (so it takes it for an actual ESC key which
will exit lazygit at the top level).
If people get mad at me they can set nextBlock-alt to <tab> and they'll have
the functionality back :)
When a user is not entering text into a prompt, the 'q' key should immediately
quit the application. On the other hand, the 'esc' key should cancel/close/go-back
to the previous context.
If we're at the surface level (nothing to cancel/close) and the user hits the
escape key, the default behaviour is to close the app, however we now have a
`quitOnTopLevelReturn` config key to override this.
I actually think from the beginning we should have made this config option
default to false rather than true which is the default this PR gives it,
but I don't want to anger too many people familiar with the existing behaviour.
