This moves all parts in the Duke/Redneck modules that access ENet into net.cpp/network.cpp and changes global ENet structs to use C++ notation instead of typedefs so that anonymous definitions for them can be added where needed.
These changes are done to avoid including enet.h globally which is a major issue because this file does not work without including windows.h, making it extremely dirty.
The code needs to be refactored anyway to allow better crosshair control but this also seemed to affect global render state, considering how poorly it was all implemented.
* removed some redundant functionality (e.g. Shift-F5 to change - use the console for that!)
* removed a few more leftover parts of the old music system
* savegames should not do more than resuming the music at the point of saving. (DN3D and RR only so far. Blood to be done.)
* handle music enabling/disabling in the backend, which simply knows better what to do. This was only working in the menu, so changing the CVAR had no effect.
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.
Unfortunately this means that the keybinding menus in all games except Blood are shot to shit right now because of how they passed the data on to its destination.
These menus are not fixable, this will have to wait until the replacement is up.
* moved the binding commands to osd.cpp. They were in the global namespace already and this way everything to be tossed out is in the same place when the time comes.
* removed support for the OSDs native CVARs. The only ones left were some internal ones I won't need until this code can be replaced.
* same for the custpmization code the games added. Duke Nukem was the only one anyway to have a decent font for it.
- disabled the user maps menu because it is hopelessly dependent on functionality that cannot be fixed. Better wait until the menu refactor to do it right - it'd be a waste of time fixing the current menus.
- 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.
Also removed the entire cruft related to this - the pointless offsetting value and the precalculation of the timer value (as if we could not afford a single division for something that WAITS!
Unfortunately this required removal of the menu option for the time being.
Blood was fine, albeit with an inverted scale, but the EDuke implementation was something very special - and not in a good way, using 4 CVARs to store the scaling state instead of one.
This is a lot of changes in a lot of code because nothing here was abstracted into the sound system. :(
Hopefully most of the affected code here can be tossed out soon, it's not pretty.
