* 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.
The remaining excpetions are the "give" CCMD and any level change action.
Unfortunately the implementation of most cheats is not multiplayer safe so right now it'd only be useful for demo recording (assuming that worked to begin with... ;))
This includes loading a level and busy-waiting for a sound to play.
Also block these loops and the sounds they wait for in network games to avoid problems from longer delays here.
The problem seems to be directly inherited from ZDoom which shows the same issue with screen wipes.
Fixes#297
* 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
Timer values in interface code are undefined, these should not access anything that changes at real time.
Also use smoothratio to do the calculation in frame time, not tic time.
This has a threshold that could lead to different behavior, depending on whether synchronized or unsynchronized input is used, it also used an undefined state of gameclock for its calculations.
By basing this on the levelclock consistency is ensured.
This timer only gets incremented by the main game ticker when the playsim is running.
This timer gets used for all playsim-related timing and animations so that these are decoupled from imprecisions in the global timer.
