Feature tankview refactor

[Enfield-303]

-Sherman 105 and jumbo cupola views zoomed in to enable proper usage -stug3 cupola view(s) reduced to one centered view -American and British tank gun-sights calibrated

Sherman 105 and Jumbo's cupola view was gaudy, looked terrible and had poor visibility, increased the zoom in the view to allow better usage of the position.

Stug3 had weird "lower" and "higher" views when in the cupola, both removed and a centered cupola view found.

American Tanks as well as some British (American made like the Sherman) had weird sight calibrations that did not fire to their cross-hair, they now fire to their respective cross-hairs.