Unified health computation for rooms. Fixed health shown in room info ensign to show full health.

git-svn-id: http://keeperfx.googlecode.com/svn/trunk@1445 40a56aae-0377-11df-bfb3-7781b9cb07ea
Minor renaming and style changes in effects code.

git-svn-id: http://keeperfx.googlecode.com/svn/trunk@1446 40a56aae-0377-11df-bfb3-7781b9cb07ea