git-svn-id: http://svn.net-core.org/repos/t-engine4@1509 51575b47-30f0-44d4-a5cc-537603b46e54

Modules required engine field is now strict: it will only use this engine, no others
The game now supports multiple versions of the engine and of modules.
There is a "Update All" option in the main menu that will download updates for all installed modules, and update the engine if they require it
Savefiles are now tagged with the module version that created them, they will not be available if that version is not installed and will load with that version, even if it's not the newest one


git-svn-id: http://svn.net-core.org/repos/t-engine4@1467 51575b47-30f0-44d4-a5cc-537603b46e54

git-svn-id: http://svn.net-core.org/repos/t-engine4@1459 51575b47-30f0-44d4-a5cc-537603b46e54

The main menu will now have a random animated background with an AI-controlled player running around in a forest, blasting things


git-svn-id: http://svn.net-core.org/repos/t-engine4@1423 51575b47-30f0-44d4-a5cc-537603b46e54

git-svn-id: http://svn.net-core.org/repos/t-engine4@1407 51575b47-30f0-44d4-a5cc-537603b46e54

git-svn-id: http://svn.net-core.org/repos/t-engine4@1374 51575b47-30f0-44d4-a5cc-537603b46e54