Improved room-related messages to use one, unified function.

git-svn-id: http://keeperfx.googlecode.com/svn/trunk@1475 40a56aae-0377-11df-bfb3-7781b9cb07ea
Rewritten adding gold to hoard in treasury.

git-svn-id: http://keeperfx.googlecode.com/svn/trunk@1476 40a56aae-0377-11df-bfb3-7781b9cb07ea
Rewritten removing gold from hoard.

git-svn-id: http://keeperfx.googlecode.com/svn/trunk@1477 40a56aae-0377-11df-bfb3-7781b9cb07ea