* feat(ui): Add Ctrl+Alt-Backspace combination key to Virtual Keyboard
Fixes#445 (somewhat)
* fix(ui): Correct virtual keyboard display when shift key is down.
Somewhere along the way, the handling of the shift-key state for letters and numbers was lost and we stopped displaying the capital/symbol for the key.
Also update page up and page down to have the space in the on-screen key.
* feat(ui): Add missing keys for virtual keyboard
Enable insert, delete, numpad equal, print scree, scroll lock, pause, system request, break keys.
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