More context menu options on tab groups

[Mozilla2048]

Add more commands that are available for individual tabs to tab groups as well:

• Reload all tabs in group
• Bookmark all tabs in group (to a new bookmark folder?)
• Destroy all tabs in group
• Mute/Unmute all tabs in group
• Select all tabs in group
• Unload all tabs in group (we need this!)

Unrelated: for that last option, we could also create an optional setting like "unload all tabs in group automatically if group is left collapsed for more than __ minutes" in the settings page.

[Jon]

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[igorlogius]

@Mozilla2048  you might find this useful https://addons.mozilla.org/en-US/firefox/addon/select-tabs-in-group/ Most of the actions you mention can be a bit quicker with it