display guild buildings build cost

[sedgwick]

When building a new building in a guild hall, the displayed text shows "Build in 'size' slot 'x'", without mentioning there is a cost dependent on the town the guild is located in. This may lead to confusion as to why the building is unable to be rebuilt, and for low level guilds/player count the cost can be a considerable burden left unaccounted for.

Solution: Update displayed buttons to show as follows: "Build in 'size' slot 'x' for 'y' gold" The code would need to account for guild location and slot size, since price varies.