wardrobe - transfer variables on item change

[TheCandianVendingMachine]

When merged this pull request will:
If a variable is set on a unit's vest, backpack, uniform; the variables will not be present on the new one. We instead transfer all existing variables onto the new item.

I can see this PR being rejected, because we don't set these variables globally. Technically, you could set a variable on a remote unit's container. As far as I know there is no way to check if this has occurred, and this information will be lost on wardrobe change. I guess if there is an event for an item change before and after the setLoadout is called, then the person who made this insane decision can transfer the variables themself

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[Andx667]

maybe we do need a before event. will add to the other PR

[PabstMirror]

but we have no way to know if the setVar should be global sync or not
e.g. gunbag needs global sync so when dropped others can get the same weapon out

I think we may need to handle this with events inside gunbag

[PabstMirror]

TFAR uses setVars on backpacks for radio settings
so we do really need something like this

this is what I came up with for controlling setVar broadcast setting

GVAR(containerVarsToTransfer) = createHashMapFromArray [
    [toLower "radio_settings", true] // From TFAR
...
private _sync = GVAR(containerVarsToTransfer) get toLower _varName;
if (isNil "_sync") then { continue; };
_item setVariable [_varName, _varValue, _sync];

so we only transfer if explicitly set?
We could also do getOrDefault false to always move but only broadcast if set?
I'm not sure which is safer

[LinkIsGrim]

Add doc comment explaining what this does?

[LinkIsGrim]

Would also note in wardrobe wiki that variable needs to be added here I guess