Add engineFramerateFixingSetProperty/GetProperty/ResetProperties

[thisdp]

For adjustable vehicle physics time step and air resistor physics when glitch "vehicle_rapid_stop" is disabled. In this way, DM players can play maps in any FPS.

Usage:
engineFramerateFixingSetProperty("vehicle_physics", 50.0/30.0) which is the default one.

Now we have only "vehicle_physics", but in future, there maybe more.

I notice that "vehicle_rapid_stop" acually includes vehicle turning (passive and active).
Passive turning includes terrain changing and colliding.
Active turning includes air control and normal on-road turning.
Thus, description of "vehicle_rapid_stop" should be "framerate_related_vehicle_physics" for better naming.

Maybe the name and usage of this function need to be discussed.

[tzwer]

Does this make it possible to have the same vehicle_rapid_stop behaviour when it's not enabled?

[thisdp]

Does this make it possible to have the same vehicle_rapid_stop behaviour when it's not enabled?

Only vehicle_rapid_stop glitch is disabled.
And maybe we need to change the name "vehicle_rapid_stop" to "vehicle_physics_framerate_dependent" later.

[Lpsd]

something like engineSetPhysicsProperty would be much nicer. if you need more words/explanation then use the individual properties/keys for that.

[thisdp]

something like engineSetPhysicsProperty would be much nicer. if you need more words/explanation then use the individual properties/keys for that.

This may be not just physics.

[Lpsd]

if it will always be used for timestep related properties, then engineSetTimestep(string property, float step)?

[thisdp]

if it will always be used for timestep related properties, then engineSetTimestep(string property, float step)?

Maybe a good idea for short naming

[thisdp]

To achieve this, maybe we need more hooker. From the test of @xLive , this PR is not enough for DM physics.
https://github.com/gta-reversed/gta-reversed/blob/c2df58461d2df0f455530132ebefb63348bb9275/source/game_sa/Entity/Physical.cpp
ProcessCollision
ProcessShift
ApplyTurnSpeed
ApplyMoveSpeed
ApplyGravity
ApplySoftCollision
ApplySpringCollision
ApplySpringCollisionAlt
ApplySpringDampening
ApplyCollisionAlt
ApplyFriction
PlacePhysicalRelativeToOtherPhysical
PositionAttachedEntity
ApplySpeed