Open up keybindings page on keypress

[mattrose]

In #665 @vssdeo implemented a search feature for keybindings, and now I want to open up the preferences window directly to the keybindings page, or create a new window on Ctrl-Shift-P that would have the same contents, for easier access.

[vssdeo]

seems the key combo is already taken 'go_prev' : 'p'

How about : 'k', I will make the change for now.

But adding key seq to a long list of keypress function breaks my heart, If the plugin util keybind makes it to the main branch, I will take this out and may be have a shortcut plugin to handle these.

• Also selecting of Keybindings page is being done for this specific case Page = 3
• A notebook tab number and title map would remove this. Which can be configurable, later.