[Chore] Add Zeus Config for all Sides

[dgibso29]

Pull Request Description

When merged this pull request will:

• Add Zeus Squad Marker Config for All Sides
• Add Zeus Radio config for All Sides
• Reduce instances of assuming this exists when it doesn't by 1000%

Release Notes

• BLUFOR, OPFOR, and INDOR Squad Marker config now includes a ZEUS configuration by default.

IMPORTANT

• Testing has been completed as necessary, depending on the nature & impact of the changes.
• The Release Notes section below must be filled out appropriately to explain the changes made in this PR. This section will be used in Framework Changelogs.
• If the contribution affects the wiki, please include your changes in this pull request so the wiki is consistently updated.
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• Title of this PR uses our standard template [Descriptor] - Add|Fix|Improve|Change|Make|Remove {changes}.

[dgibso29]

Confirmed working in MP.

Set up using the 'direct' function just in case there's ever a desire for Zeus groups on more than one side. Doesn't seem to cost us anything to support that by default.

[Bubbus]

Confirmed working in MP.

good enough for me lmao

I have just realised that we don't have any null-checks in the squad marker macros. Looks like we've been getting away with it, I guess you can use setVariable on grpNull lol