Unit Selection

I made a few tweaks, bug fixes, and additions to combat in this build, but mostly I completely overhauled how factions/units/unit types/soldier prototypes etc...were organized, using scriptable objects and a lot of refactoring, in order to enable unit selection and passing the selected unit data, deployment location and so on to the battle scene. You can select now from two factions, each with a distinct army list, and choose up to 16 units for them. The available units per dropdown slot are limited such that the core character of an army cannot change, but there is still a lot of leeway in number of infantry vs cavalry vs lights or medium foot or bowmen etc...this is the first very early build of the unit selection, so it may be a bit buggy and it's certainly ugly, but with unit selection and optionally playing hotseat or vs AI it should be more testable.