Parse Kitty Keyboard Protocol esc codes to suport Ctrl-Shift-<Key> shortcuts

[Cal (UnnaturalTwilight)]

Adds parsing for the most basic form of Kitty keyboard events. This fixes the existing Ctrl-Shift-z shortcut for redo when using a terminal that implements the kitty keyboard protocol. I have also add Ctrl-Shift-c as an additional shortcut for copy since that is often used in terminals.

Not a full implementation but solves some of: #29

I have tested this in Kitty on linux and in Windows Terminal through WSL.
I have only tested this with an en-us qwerty keyboard layout.

[Cal (UnnaturalTwilight)]

@microsoft-github-policy-service agree

[Leonard Hecker (lhecker)]

...but you aren't enabling the Kitty Keyboard Protocol on startup?

[Cal (UnnaturalTwilight)]

Per the spec, any key sequence that can't be represented without the Kitty Keyboard Protocol is sent using it regardless if it is requested. I was trying to avoid affecting any of the current parsing logic but if you think it is better to enable it I can add that.
https://sw.kovidgoyal.net/kitty/keyboard-protocol/#:~:text=Any%20key,enhancement

[Leonard Hecker (lhecker)]

Since nothing is using Ctrl-Shift combinations yet we can take our time to do this properly: Implement a full Kitty Keyboard Protocol integration. One of the problems here is that this PR is using from_ascii but the protocol does not limit the key code to ASCII.

[Cal (UnnaturalTwilight)]

I have now done a more complete implementation of the first level of progressive enhancement for the protocol. I don't think higher levels of enhancement are necessary for what edit dose.

I was not able to find a relevant vk constant for numpad equals which is why it stands out in the list.
I also couldn't find an applicable vk constant for the menu key which is the only one of the keys that are currently ignored that I think may make sense to add key a keybinding to.

I have also now tested this with a french keyboard layout to confirm that non-ascii characters work properly.

[Dustin L. Howett (DHowett)]

Funny enough, the "menu" key is VK_APPS or 0x5D.

[Cal (UnnaturalTwilight)]

I have rebased this pr and added parsing for the menu key and super/win/command as a modifier. I have bound the menu key to focus the menubar, same as F10, as that seems to be standard behavior when there isn't a r-click menu. I have not implemented any shortcuts on super as they would primarily be for macos and I do not have a mac, but they should be easy to add in the future by anyone who wants to.