Copy Lobby URL to clipboard when clicking "Invite" avatar

[meichthys]

This allows anyone in a Lobby to click the "invite" avatar to copy the lobby URL to the user's clipboard:

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Issue number

Relevant issue number

• Related to #674

Please check the following

• [?] Do the tests still pass? (see Run the Tests)
• [?] Is the code formatted properly? (see Linting (Formatting))
• For New Features:
  • [ ] Have tests been added to cover any new features or fixes? No
  • [ ] Has the documentation been updated accordingly? No

Please describe additional details for testing this change

[meichthys]

I'm not sure when I'll get around to these additional requests, but I do agree that they make sense and should be implemented. I just don't have much (any) experience with javascript/cypress/sails.

[itsalaidbacklife]

Closing as stale