Impletmented Data.getTranslationList().

[NEW] Impletmented Data.getTranslationList().
Removed automatic version upgrading.

[DEL] Removed identifier parameter in Core.save().
[DEL] Removed automatic version upgrading.
Added GameSystem.

[NEW] Added GameSystem.
[MOD] Make GameMessage can be restored.
[DEL] Removed data/scripts/setup.lua.