* 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
* 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.
- Inline function returns a double, therefore we should use it and not potentially truncate the mantissa.
- Use divisors to get true numbers of some floats (3.333 -> 10/3, etc).
- Remove a few brackets/parentheses where possible from what are already exceedingly bracketed lines.
This needs to be replaced with the game independent ZDoom version and hooked up properly, but it of low priority because it's a multiplayer only feature.
Reverted this to a sane setting, as it was in the original games and in all other games I have ever seen, i.e. there is a global setting to enable mouse view, and a button to manually trigger it. The toggle can be easily handled by flipping the CVAR directly.
The main problem here was that it triggered a few cases for mouse-less gameplay in the default case with a mouse present, because the mouseaim CVAR was no longer what the game expected.
This misguided change seems to have originated in JFDuke but by now had propagated to all the other games as well, the code was in all 4 frontends.
This was consolidated for both EDuke and RedNukem frontends, put into a class with strict access control and the length limit was lifted.
The new class will eventually allow better localization control.
This removes all unused parts of the implementation and moves the rest to the InputState class for easier replacement later. All MACT is doing now here is to call the UpdateStatus function, the internal workings are no longer relevant.
