Now this was magnitudes easier than the EDuke menu - NBlood's menu is actually clean and usable code but still nothing compared to a unified menu system.
This was only a crutch to let the input interface work with the original menus.
Now that the one in Blood is gone, all the conditions are no longer relevant. (Shadow Warrior never got far enough to implement this)
Not tested yet!
* Added a JSON-based header to the savegames so that the unified menu can read from a common data source.
* moved loading and saving of frontend independent data to the wrapper so that support is automatic.
- consolidated the 3 identical S_OpenAudio implementations. The replacement code is disabled for the time being because it needs a rewrite. The replacement logic is uses is a bit too volatile.
- removed the old GRP scan code.
Some part are not done yet, and the file system data is currently ignored - there's no way to properly set this up with the file system code Build came with.
- consolidated Polymost precaching and removed precaching for static tiles because they now are always loaded.
- removed cache configurability. On modern systems this is relatively pointless - allocating 50 or 100 MB is a non-issue - and the cache is due for replacement anyway.
