Robotic gibs spawn as bone/meat gibs in dedicated coop games.

[Frank Sapone]

As the title states. The reason for this is GetModelSkinName relies on access to the client_t structs in gib.cpp. GetModelSkinName also requires ref_gl.

[Daniel Gibson]

Issue #154 was marked as a duplicate of this issue.

[Frank Sapone]

Made a special table with the skin files and checks if an enemy is robotic. Previously only half-worked because the monster name was cleared during part of the gib spawning. So now we copy the className and free it when we're done with the gibs.