* Pre-requisite to make it possible to stop using Q16.16 for horizon input.
* Perform look up/down and aim up/down using true pitch without the need for a helper.
* Adapt SW's return to center function to work based on true pitch (Duke's is a bit too fast for my liking).
* Duke's aim up/down and look up/down is 6 & 12 respectively, SW's is 8 & 16 respectively. Let's go half-way at 7 & 14.
* Need SW's input helpers available for Blood but therefore also need an angle delta function that does not seem to exist in Blood.
* Realise that gamecontrol.h/cpp might not be the most appropriate place, but it's a shared location and these will go into binaryangle.h when its utilisation can be more realised.
* Because SW's logic was reversed, in that param #1 was the new angle and param #2 was the current, all calls have been reversed.
* By happenstance, also fixes an issue with multiple 180° turns in quick succession.
* Split input bits and movement into separate functions.
* Reordered movement to be more like Duke/SW for ease of comparison.
* Removed a global.
* Removed a few includes.
* Looking up/down is a bit rough at first as q16look is disproportionate to where the player is currently looking.
* Won't be an issue with a unified horizon algorithm in the backend.
* Changed config so `cl_interpolate` bool doesn't apply to player's overall movement. While it might be handy for debugging moving sector objects, I see no valid reason why there'd be a need to ever un-interpolate the player's position.
Brightness is now correct - I have no idea why this factor of 1/0.85 is needed - something must reduce the brightness of the entire scene but I have no idea what.
This fell victim to some fudging code that was needed to avoid crashes with the original game loop.
All that fudging could easily be removed now because nothing of it is needed anymore.
They created different code depending on the passed index, this was changed to always emit the optional parameter, even when not needed, so that the interpreter does not need to second-guess.
Not everything will do something, though. This was some incredibly careless code operating without a safety net allowing uncontrolled write access to the map structure.
Most of the critical fields have been made read-only, which has been the only mode of access in the mods I checked.
Note that this does not enable scripting of the weapon sprite drawer, only the gameplay related features were done.
