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Store possible formations for a civ in XML instead of the JSON.

Description

Store possible formations for a civ in XML instead of the JSON.

The JSON was purely GUI at first, but has gotten some simulation content over time. Not all of that was necessary/correct to do.
When the formations were added (r11735 / rP11735) there was only a generic player.xml (https://code.wildfiregames.com/source/0ad/browse/ps/trunk/binaries/data/mods/public/simulation/templates/special/;11735) and differentiation was added only later.
The formations in the XML is more logical and allows inheritance.

Differential revision: https://code.wildfiregames.com/D4466
Idea approved by: @wowgetoffyourcellphone