Altered melee units

Changed knights cost and weapon to be more like the dox-at-arms, gave
the camel rider the knights weapon, so it might be worth something in a
fight.

Really need to investigate the possibility of new models, and new icons.
Revert "Altered melee units"

This reverts commit c411a9b89936541589dda373fdc95fca3538c764.
Revert "Revert "Altered melee units""

This reverts commit 9a7786fa0bc9ddf2bbf06f88645ddc40093c58fe.