CSW - Fix and Improve reloading

[LinkIsGrim]

When merged this pull request will:

• Fix linking belts not returning unspent ammo.
• Change bad params usage.
• Close CSW - Belt Linking does not return unspent rounds #9233.
• Change progress bar text to match rest of project ("load [magazine]" > "loading [magazine]...", etc)
• Improve FUNC(reload_canLoadMagazine) conditions.
• Improve function headers and comments where applicable.
• Improve reloading to always pull from best ammo source, not just best magazine in ammo source.
• Reduce range of nearSupplies check. 10 meters was excessive.
• Remove distance check for latter part of AI reloading. Justification in comments.
• Return ammo from belt linking to unit doing the action directly if the magSource can't be found or if it is a WeaponHolder.
• Fix missing _unit param in events and logging.
• Fix AI GetIn on an empty static before any weapon is fired.
• Move getting mag sources to FUNC(getNearbySources).
• Cache nearby mag sources.
• Add public function FUNC(getSourceCompatibleMags): returns a source's compatible carry magazines with ammo count.
• Add public function FUNC(compatibleMagazines): returns a CSW's compatible carry magazines.
• Add ammo to return of FUNC(reload_getLoadableMagazines). Done to optimize the checks for best ammo to send.
• Make FUNC(getCarryMagazine) public.
• Cache compatible vehicle and carry magazines of CSW weapons.
• Improve FUNC(reload_getLoadableMagazines) by making use of new functions.
• Make FUNC(ai_reload) use FUNC(reload_getLoadableMagazines) directly: parameter was added to use the turret path in the latter.
• Change all instances of _staticWeapon in parameters to _vehicle.
• Change all instances of "Static Weapon" in function headers to "CSW".
• Add ace_csw >> container property to Mk6 Mortar variants.
• Add public function FUNC(getAvailableAmmo): returns nearby compatible magazine types and sum of their ammo. Intended for ZEN compatibility.
• Add support for limiting AI reload to a single type of carry magazines by setting ace_csw_forcedMag.
• Add public function FUNC(unloadMagazines): unloads magazines in turret path.
• Add public function FUNC(ai_switchMagazine): forces AI to reload specified magazine.
• Add support for getting vehicle magazine from weapon magazineWells.

MP tested and objNull/no container/full inventory-resistant.

I did not intend for this to grow so much, but here we are.

Review after #9238 and #9255.

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[LinkIsGrim]

The public functions were made with ZEN compatibility for CSW Artillery in mind, I intend to make another PR for the remainder of that. Sorry for the scope on this, but it'd have been merge conflict or PR-dependency hell otherwise.

[johnb432]

1. Add comment describing that this is handling proxy weapons. That's some bullshit I wrote, it handles carry magazines.
2. GVAR(compatibleMagsCache) is not a good name for this imo, should be renamed to something that includes "proxyWeapon" (e.g. GVAR(compatibleCarryMags)).

[johnb432]

If the container has forceSupply set to 1 and you empty it (either by using the commands above or using other cargo manipulation commands), it will be marked for deletion, regardless of if you add items after the execution of this command.

[johnb432]

Why?
FUNC(reload_getLoadableMagazines) doesn't follow the same logic, which could lead to a desync of information.

[johnb432]

Description of _clearForcedMag is Clear forced magazine after reloading. However, in line 46 it can still fail. Furthermore, this variable technically reset before reload. Do we need to absolutely reset it after the reload has finished (so when the turret events are called) or can it be called just after line 53?

[johnb432]

1. GVAR(compatibleVehicleMagsCache) is only used in FUNC(getVehicleMagazine), which in turn is only called when mags are either loaded or unloaded. Imo caching this is not necessary.
2. Both GVAR(compatibleVehicleMagsCache) and GVAR(compatibleMagsCache) don't save magazines belonging to non-proxy weapons.