I seem to have forgotten to add loot to Tengu's stable. Fixed

Fixed the ability to Buy Betsy

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.