Mouseclicks are no longer delayed (#353)
Mouseclicks are no longer delayed (#353)

This patch changes the mouseinterval to 0. And handles detection of
doubleclicking events internally.

This allows much faster response times for mouse clicks as nnn no longer
has to wait for ncurses to confirm what type of click it was.

It introduces a new config setting for changing how many milliseconds it
may take for a double click to be registered.
jarun/nnn,jarun/nnn,jarun/noice,jarun/nnn,jarun/nnn,jarun/noice