* Set `PF2_INPUT_CAN_AIM` explicitly where `DoPlayerHorizon()` would have been done within the original game.
* Replace original centering code and route `SB_CENTERVIEW` through the `SB_LOOK_UP`/`SB_LOOK_DOWN` code.
* With this commit, first person input is now nice again. Vehicle code still to be looked at.
* Set `PF2_INPUT_CAN_TURN` explicitly where `DoPlayerTurn()` would have been done within the original game.
* Uplift the turn 180 code to full Q16.16.
* Eliminate stupid input scaling so input matches that provided by the input device.
* Ticrate angle adjustments outside of the player's control still to be uplifted.
* Provide read-only/const results from `CONTROL_GetInput()` so games can't change received input.
* Change non-descript `info` to `hidInput` (Human Interface Device).
* Remove a few unused prototypes.
* Remove bool `PedanticMode`.
* Transition appropriate lines to `cl_syncinput`.
* Remove inlines added purely only to maintain DOS demo compatibility.
* Fix a few pedantic Q16.16 >> Int >> Q16.16 conversions.
* Remove fix16.h/cpp and utilise library from m_fixed.h.
* Extend m_fixed.h with two inline functions for int to/from float operations.
* Replace fix16_floor operations with those from xs_Float.h
* Replace multiple Q16.16 conversions from 0 to just be 0.
* Replaced all found in-game bit-shifts and multiplications/divisions with inline functions from m_fixed.h
* Replaced many casts of FRACUNIT as double in SW's panel.cpp as it is converted to double by way of type promotion.
* Fixed missed precision fixes in SW's panel.cpp where some types weren't declared correctly.
* Replaced 100+ `Cos()/Sin() >> 16` operations for Blood with inline functions `CosScale16()/SinScale16()`.
This is because 'classic' aim mode will reset the view if the mouseaim key is not pressed.
The problem with this is that an empty input packet will trigger a view reset. If the meaning is inverted the default aim mode is free mouse view which doesn't try to alter any view state and is therefore preferable for an empty packet.
Fixes#292
None of this was really working anymore, but will have to be rethought once a network stream exists again.
But even then, this is better sent as a separate command, and in MP only.
Currently the bit fields are still separate and they have to be merged, but for now the added memory does not matter.
Having this structure in the common parts will allow work on consolidating the input code, though.
This removes most of the InputState class because it is no longer used.
The only remaining places still checking scan codes are the modifiers for sizeup and sizedown.
All the rest was remapped to safer methods. The multiplayer taunts are currently inoperable, they will need support of shift-bindings to get proper support.
