Add schurzen to panthers & jagdpanthers

[Matt Hands]

Schurzen were modelled as several static meshes showing varying degrees of damage, with matching textures for most camo variants. But they remained unused in DH files.

Have implemented, with random choice of schurzen damage version (by server) and spawned only on client as a vehicle deco attachment. Replication is only one byte and only if a schurzen attachment is available and is selected by server (there is a chance of none).

Only difference between panther & jagdpanther is positional offset of attachment.

Textures available for panther camo 1, 2 & 3 & Ardennes2 and for jagdpanther base & Ardennes. No textures for panther base, Ardennes1 & snow variants or for jagdpanther camo2.

[Matt Hands]

Implemented in commit 605cfde