Add Cmd+a and deletion of selected text

[LeonSnajdr]

[dhanoosu]

Hey, thanks for the pull-request! Whilst this mimics the behaviour of Windows Terminal, however in Linux terminal pressing Ctrl-a actually move the cursor to the beginning of the command (same as pressing Home).

But I think this is a good addition. I can accept this pull request, but perhaps remove the binding for Control-A? This actually map to key presses of Ctrl + Shift + a - it doesn't mimic any of terminal behaviour of Windows nor Linux.

[LeonSnajdr]

@dhanoosu Thank you for responding. This sounds like a reasonable solution. I will change it as soon as I have time :)