Fix regression caused by the fix 0de16334d3 ("micro: Don't forward
nil events into the sub event handler"): even if the terminal was
started with `wait` set to false, it is not closed immediately after
it finished its job, instead it shows "Press enter to close".
The reason is that since the commit b68461cf72 ("Terminal plugin
callback support") the termpane code has been (slightly hackily) relying
on nil events as notifications to close the terminal after it finished
its job. So fix this by introducing a separate CloseTerms() function
for notifying termpanes about that, decoupled from HandleEvent() which
is for tcell events only.
According to tcell documentation, Rune() should only be used for KeyRune
events. Otherwise its return value is not guaranteed and should not be
relied upon.
This fixes issue #2947: Esc key not working on Windows, since tcell
sends lone Esc key event with rune == 0 on Unix but with rune == 27
(the keycode) on Windows.
This commit exposes the separate infopane bindings to configuration
from the user. This also adds support for separate bindings in the
terminal emulator view. Default bindings are provided, but can also
be rebound in bindings.json.
