Add versioned options

[drojf]

Versioned options would let us do stuff like have the Umineko PS3 sprites as an option which is installed by default, so people can revert to PS3 sprites without re-installing the whole mod.

The reason we can't do this currently is that mod options are always installed if selected - so the Umineko PS3 sprites would be installed on every update (which is a huge file).

The main issue is dealing with:

• If you change your selection for an option, the option should always be installed/there needs to be a version for each possible selection
• if install order of options is important, any options which are installed before this option should also be installed (not sure if our games require this to be true though)
• should allow non-versioned options which are always installed (if they are small and have no dependencies), but havent thought about this much (not sure about this one)
• on update, reading the currently selected option, and restoring that into the installer page, so you don't need to re-select all the options every time you update (this might be difficult)

[andOlga]

If I recall correctly, the same package that includes PS3 sprites also includes a whole bunch of other stuff, so not installing it is simply not an option (and I'm kinda afraid of separating it into a sprite-only pack in case the other sprite packs are missing stuff).
Therefore, this could be solved simply by adding the PS3 pack as a mod option (e.g. "Revert to PS3 sprites") while also keeping it as part of the base install.

[drojf]

that sounds good - I'll try that out for now (well...at some point), as it doesn't require any changes to the installer