Bug 1443652 - fix for updater reducing the security of installed versions. This also moves the update check cache to the normal store (e.g. registry or OpenRails.ini) rather than custom store so installed versions don't check too frequently.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@3006 a9f3cfff-6c41-7446-b0ca-052bd761e6eb