Change: Overhauled new game window.
Codechange: Dropdowns automatically untoggle and set text on their parent button.
Fix: Dropdowns with height per item other than 20 weren't displayed correctly.
Fix (r1922): Included stub function to allow loading savegames made between r1896-r1921.

git-svn-id: http://corsix-th.googlecode.com/svn/trunk@1964 c39591fa-788f-11de-a72b-d90af8dea425