American Conquest unit fixes: 18th Century Russian 2016-10-05

Bugs fixed: there were patches of Civ-coloring in places where it shouldn't be, so I edited all the animations to fix that problem. In addition, somehow the death animation was merged with the Russian Fusiler's death animation (which, if I may say looked pretty darn wierd), so I deleted all the erroneous frames. Finally, I linked sounds to the Explorer, and Made Civilopedia icons and a Civ-Color correct Units_32 icon.