Added Farm-Pillaged image

Resolved  - added option for pillaged improvements

Resolved  - trades evaluated correctly

By vegeta1k95:
- Blockade mechanics 
- Out-of-move units are half-opaque relative to base setting 
- Fix selection opacity for non-full-opaque flags. 
- Experimental: mitigate texture swapping with TextureArraySpriteBatch 

Improve UX  - By Gualdimar