It turns out that it's possible for OSG plugins to be spread across multiple directories, and OSG doesn't account for this in osgDB::listAllAvailablePlugins(), even though it works when actually loading the plugin.
Instead, use code that's much more similar to how OSG actually loads plugin, and therefore less likely to miss anything.
Incidentally make things much simpler as we don't need awkwardness from working around osgDB::listAllAvailablePlugins()'s limitations.
That way, we don't have issues like the checker getting false positives when the right plugins are present for the wrong OSG version or build config, or false negatives when we've generated the wrong filenames.
The old code was legal, and the things it did worked in other places, so should have worked here, too.
Hopefully just rearranging stuff convinces what I assume to be a compiler bug to not happen.
This one's a biggie.
The basic idea's that GameSettings should know:
* what the interpreted value of a setting is, so it can actually be used.
* what the original value the user put in their config was, so it can be put back when the config's saved.
* which path it's processing the openmw.cfg from so relative paths can be resolved correctly.
* whether a setting's a user setting that can be modified, or from one of the other openmw.cfg files that can't necessarily be modified.
This had fairly wide-reaching implications.
The first is that paths are resolved properly in cases where they previously wouldn't have been.
Without this commit, if the launcher saw a relative path in an openmw.cfg, it'd be resolved relative to the process' working directory (which we always set to the binary directory for reasons I won't get into).
That's not what the engine does, so is bad.
It's also not something a user's likely to suspect.
This mess is no longer a problem as paths are resolved correctly when they're loaded instead of on demand when they're used by whatever uses them.
Another problem was that if paths used slugs like ?userconfig? would be written back to openmw.cfg with the slugs replaced, which defeats the object of using the slugs.
This is also fixed.
Tracking which settings are user settings and which are in a non-editable openmw.cfg allows the launcher to grey out rows so they can't be edited (which is sensible as they can't be edited on-disk) while still being aware of content files that are provided by non-user data directories etc.
This is done in a pretty straightforward way for the data directories and fallback-archives, as those bits of UI are basic, but it's more complicated for content files as that uses a nmodel/view approach and has a lot more moving parts.
Thankfully, I'd already implemented that when dealing with builtin.omwscripts, so it just needed wiring up.
One more thing of note is that I made the SettingValue struct storable as a QVariant so it could be attached to the UI widgets as userdata, and then I could just grab the original representation and use it instead of needing any complicated mapping from display value to on-disk value.
There's also handling for files declared as originating from a lower-priority openmw.cfg, e.g. anything in the local config or any intermediate ones, as they can't be disabled or reordered.
There's no way to mark such files yet, but the logic's the same as built-in files, so everything will be fine once that's set up.
Previously it was quasi-mandatory - lots of things would add it, e.g. when running openmw through the CS, but it could technically be disabled.
Now it's treated like the resources/vfs directory and implicitly added by the engine etc.
