[gameplay] Tweak Ranged spreads, reduce archer spread, tweak cosmetic stats.
The major change here is that Archer spread is reduced to 2 to make them have much better aim than before at max-range, where they often missed. This makes their DPS more predictable over their range.
This makes ranged unit's spread proportional between citizen soldiers, advanced/elite CS, champions and heroes.
Because of the spread reduction and because promotion more strongly reduces spread, the 10% spread reduction from the archery tradition technology is removed.
Gravity values are tweaked.
LaunchPoint values are raised and standardised by unit type.
Patch By: Nescio
Differential Revision: https://code.wildfiregames.com/D3374