Feature/tp2squadmate

[Crowdedlight]

Pull request adds the Teleport To Squadmate feature together with some helpers used in this feature:

Teleport to squadmate allow GM to right-click a player and select what squadmate to teleport the player to. Makes it easy to move a lost or respawned player back to his squad.

1. Adds ListBox dialog GUI. Can be re-used if a single-select listbox is needed elsewhere.
2. Adds loghelper, to try and standardize format for error prints. (Only this PR is using is. If you agree it makes sense I can do another PR after this, that changes existing errorprints to use it).
3. Adds GroupHelper to get group from player entity. (Thanks Kex! Using your RSA helper)

This feature does not work on AI or AI groups as it would require specific handling and at this point, AI can't be in groups with players anyway.

[Kexanone]

Trying to use this action while a team mate is in the respawn menu, produces a script error.

[Crowdedlight]

Trying to use this action while a team mate is in the respawn menu, produces a script error.

I had forgotten a null check for dead players. Added now. Although if all squadmembers are dead now, so the list is empty, it just shows the empty list. Maybe would be better if empty list, to close the list and show hint to GM that there is no valid squadmembers to TP to?

[Kexanone]

Trying to use this action while a team mate is in the respawn menu, produces a script error.

I had forgotten a null check for dead players. Added now. Although if all squadmembers are dead now, so the list is empty, it just shows the empty list. Maybe would be better if empty list, to close the list and show hint to GM that there is no valid squadmembers to TP to?

I would say either way is fine.

[Crowdedlight]

Trying to use this action while a team mate is in the respawn menu, produces a script error.

I had forgotten a null check for dead players. Added now. Although if all squadmembers are dead now, so the list is empty, it just shows the empty list. Maybe would be better if empty list, to close the list and show hint to GM that there is no valid squadmembers to TP to?

I would say either way is fine.

I think I am just going to leave it be an empty menu for now. Only in rare cases it would happen. The other approach would require making some hint helper, to send localized hints to specific players over Rpl. As the context-action is run with IsServer so would need to somehow get dynamic playerID of the current zeus, and then rpc the show-hint function to that player_id. And not quite sure how to actually get current zeus, from a function run on the server.