Keepassxc: Add more global shortcuts

[force1164]

Summary

Add more global shortcuts like in official app for windows.
I miss specifically:

• toggling the window into focus so that user do not have to always click the tray icon
• autotype password only - I know it can be set per item as typing option, but I use it for a lot of entries and it would be much simpler to just have the feature out of the box.

Examples

Pressing Ctrl + Alt + K instead of clicking

Pressing Ctrl + Alt + Shif + A
to fill only password

Context

I came from windows and the app on windows does have this features and it is easy to get used to them, but then it is hard without them. Thank you

[droidmonkey]

Already working this for 2.7.0