MultithreadFix: slight FPS boost via multithread improvements

[emoose]

As mentioned at #44, this removes D3DCREATE_MULTITHREADED safety flag for a slight FPS improvement, and adds some fixes for deadlocks caused by flag being removed.

A MultithreadFix option is added to [DISPLAY] section of INI to toggle it, haven't added GUI stuff for the setting yet though.

This seems to boost FPS by +40-60 for me when running with framelimiter removed, so hopefully will help with FPS drops when playing normally too.

Haven't tested it that much yet though, would appreciate anyone giving it a try! If you get any crashes/hangs please let me know. (maybe create a CrashDumps folder next to bio4.exe first before testing it)

You can grab release build from https://github.com/nipkownix/re4_tweaks/suites/7489522135/artifacts/307461430 - just make sure to edit dinput8.ini and set MultithreadFix to true first.

[nipkownix]

Latest test build here:

https://github.com/nipkownix/re4_tweaks/suites/7489522135/artifacts/307461430

[nipkownix]

Been testing this a bit more lately and haven't had any weird stuff happen so far.
Looks like we're not getting much more people interested in testing as well, sadly.
I'll probably rebase this onto current master (after the trainer merge?) and send a test build to albert. Hopefully he can have some of his testers play with it as well, so we can merge it soon.
A new release approaches :p

[emoose]

Rebased onto latest master, build is up at https://github.com/nipkownix/re4_tweaks/suites/9400765838/artifacts/443597531.

For me this lets r101 go from ~220FPS when looking at village, up to ~250-260FPS
While moving camera to the side (copying the radio call anim) went from ~800FPS to ~950FPS.
Not as big an improvement as dxvk, but still an improvement overall, maybe if it tests as stable enough we could let it be the default for d3d9 users.

[nipkownix]

Many thanks once again!