About the pull request

Fixes a bunch of things with vehicles in general and for admin usage.

• Tank couldn't collide with vehicle blockers for past 2 years due to an apparent oversight, letting it get eg. into caves. This is fixed
• Fixed an issue with some hardpoints covering the turret of the tank and its hardpoints
• Made the admin spawned 'tank coupon' tank properly broken for repair
• Added an 'APC coupon' in the same vein as Tank's
• Because Tank Coupon is a Techwebs relic and now an admin tool, it doesn't spawn VC pamphlets in ASRS anymore. Spawn them yourself!
• Fixed a bug where bringing up a Tank via coupon as first vehicle would only give you access to APC gear in vendor.
• Added bitfield definition for vehicle_flags

Explain why it's good for the game

I don't know if it is, but it's at least good for the admins using these

Changelog

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fix: Fixed the tank driving through vehicle blockers and accessing "deep" parts of the map it wasn't intended to push.
fix: Tentatively fixed some visual bugs with turret based vehicles.
fix: Fixed using the tank coupon as first vehicle spawn causing Gear Vendor to still give out APC gear.
admin: Added an APC coupon in same vein as Tank Coupon for Admins to use.
admin: Tank/APC Coupons now spawn broken down versions of the vehicles, for the full VC experience. You want a ready to use one, just spawn it.
admin: Tank/APC coupons do not spawn VC pamphlets in ASRS anymore.
admin: Added a vehicle_flag for tanks to bypass blockers (in a legit fashion this time). Abuse at your discretion.
/:cl: