Adds some new features with the winning letter.
Changes are described in issue 1038

Plus a fix for an error when using the demo.
Described in issue 1622.

Thanks, Mark!

git-svn-id: http://corsix-th.googlecode.com/svn/trunk@2336 c39591fa-788f-11de-a72b-d90af8dea425
This patch widens the space for custom game names a little.

It also fixes a contradiction - at the start of the demo level it tells you "Unfortunately the demo version only contains this level (apart from custom levels)." 

If you are meant to be able to play custom maps with demo data, then perhaps we need to remove the notice and allow the game to load them. Removing the contradiction seems to be the best option at the moment.
This can be discussed (issue 1454).

Thanks, Mark!

git-svn-id: http://corsix-th.googlecode.com/svn/trunk@2337 c39591fa-788f-11de-a72b-d90af8dea425