#712 Friendly ESC KeyPress event process in Commit dialog

[Tide]

When editing comments in the Commit dialog, if ESC key is pressed, the dialog closed at once, and the comments are lost without confirmation.

In a Simplified Chinese Windows system, we type Chinese characters by Input Method program, and all Input Method program use ESC key to clear input if use mis-typed.

So when we type Chinese in Commit dialog, we will have more chances to lost the comments which is edited for several minutes or more time.

So I hope there's a confirmation when ESC key is pressed or Cancel button is clicked in the Commit dialog, or, TortoiseCVS can 'remember' the comments before ONCANCEL event occured and load the remembered comments in the next Commit dialog.