* moved Smacker video playing code into the backend, so now all games can play all supported video formats
* logos and level intro/exit videos use ScreenJob
- delete some voxel code that's software rendering only.
- apply Big Endian byte swapping for SFXs, as well, now that this no longer involves hacking the file system cache.
Messing around in the file system cache should be a no-go, so now it's no longer done.
This also allows reenabling the byte swapping needed for Big Endian.
The entire method at use here is essentially not correct. Interpolation should be handled independently of the game timer directly based on the underlying clock, like in ZDoom.
There's interpolation bugs in the Build games that cannot be fixed if totalclock is used for it, but if we use something else we do not need a fractional totalclock.
* Calculate game-side mousex/mousey divisions into the calculations performed in `InputState::GetMouseDelta()`.
* Fix mouse speed when `in_mousesmoothing` is true (wasn't factoring in / 3.f division used in non-true vector.
* Standard mouse forward/side movement speeds in Exhumed & SW with that of other games.
* Remove `strafeyaw` code from Duke/Exhumed/RR as it's not necessary and was leading to situations where the player would continually keep moving sideways even without input.
* Change mouse forward/side velocities to -= current value as is done with controller input and the player's angle/aim velocities.
* Convert axes in ControlInfo struct from int32_t to float as what's received from the backend.
* Remove all the scale up/down math since we don't need that with floats and replace with float constants that match old behaviour.
* Store q16mlook scaling as a constant for use with mouse and upcoming controller code.
* Add required controller code to Blood as the only game not to have working controllers.
* Fix typos in (gInput.forward > input.forward) for `ctrlGetInput()` in Blood.
* Remove use of `scaleAdjustmentToInterval()` on Exhumed and Shadow Warrior as they only process forward/side velocities within the game's ticrate.
* Repair angvel/aimvel scaling mistakes from d79a5d256d.
* Scale dyaw and dpitch by 25% for Shadow Warrior as the game runs 25% faster than the other games, leading to faster input.
