[gameplay] Tweak market technologies
- Remove movement speed technology, which was a straight trade bonus.
- Buffed health tech from +2 armour to +50% HP, moved to town phase, made costlier.
- Changed gain of trade techs to +15% each.
The intent is to slightly reduce the snowballing effect from trade techs.
Patch by: Nescio
Comments by: borg-
Differential Revision: https://code.wildfiregames.com/D3357