Bind a key to the clear action

[ckundo]

May I suggest giving the clear button a keyboard binding, escape. This would make it quicker to operate with keyboard only, a good usability and accessibility enhancement. escape is conventional for exiting a modal state. Maybe a part of #84 .

[annejan]

Done in master, will be in 1.1.1 release.

[ckundo]

Thanks @annejan, great work!