Browser gestures

[spbisc97]

I have added browser's tab gestures.
I personally use horizontal 3 finger gestures to move between tabs and vertical 3 fingers gestures to close and open tabs, this works in browser but also in other tabs based apps like vscode

{
        'Previous Tab' => keystroke( ctlr + page_up ),
        'Next Tab' => keystroke( ctlr + page_down ),
        'Close Tab'=>keystroke( ctlr + w ),
        'Restore Closed Tab'=>keystroke( ctlr + shift + t ),
}