Cossaco and Murmilos Visual Update

Both Cossaco and Murmilos were severely lacking in visuals simply due to being half the resolution of everyone else. Addressed that.
Changes across the board to both of them.

Some snippets

• Dismount is now base part of the necro.
• Scavenger is back to what it was.
• Some upgrade changes.
• Ankerriter is much less tanky.
• New acts for both - a grab attack for cossaco and a sword for Murmilos.