graphics update for the shadow mage line

New baseframes, standing animations an ranged animations for rogue mage,
shadow mage and shadow lord.

This commit replaces the older work of Blarumyrran with new versions by
him. Animations are partly by aquileia.
png optimisation

using pnggauntlet because wesnoth-optipng expects a UNIX shell
graphics update for the shadow mage line

New baseframes, standing animations an ranged animations for rogue mage,
shadow mage and shadow lord.

This commit replaces the older work of Blarumyrran with new versions by
him. WML by aquileia.
Merge pull request #99 from aquileia/master

graphics update for the shadow mage line