Added research for the horse limb replacements

Changed the horse thieving and buying dialogues, it should always opt for buying the horse now, if you have the credit in.

Changed horse dealer dialogue to more comprehensive in the situation the player does not have enough money.

Returned Serenity back to its place, removed my test start

Returned Serenity back to its place

Added two gas masks for the horses, they use vanilla textures.

Oatsfarming and production overhaul.
Added hydroponic oatsfarm, haystack storage for wheatstraw and oatstraw, threshing instead of silos.

Production chain:
farm -> oatstraw
tresher -> oatstraw in oatsgrain out
manufacturing -> cook oats or silage

Oatstraw storage,
oats and oatsgrain silos fixed

This should fix the idle animations/portraits issue. Let me know. Does not fix the prospecting, sadly.