Add "Toggle feature selection" button to the Identify Results panel

[qgib]

Author Name: Nikolay Lebedev (Nikolay Lebedev)
Original Redmine Issue: 14638

Redmine category:gui

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Identify Results panel has lots of buttons, including "view feature form" and "copy feature to the clipboard" buttons, but misses the "Toggle feature selection" button, which allows to add feature to current selection right out of the identify results panel. This tool is very handy when selecting a one particular feature out of many overlapping ones. Although it's present in the context menu of the identified feature, it'll be great to have it as a button on the panel itself, and ideally a hotkey for it to speed things up even more.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• easy_fix was configured as 0