Added new physics functions

* Added some new physics functions
* Added new documentation
* Added some auto checks for OS to rc_os_defines.h
* Fixed bugs on settting and getting position of sprites

doc/files/deletejoint.txt

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+#title DeleteJoint [RCBasic Doc]
+#header Sub DeleteJoint( joint_id )
+
+Clears a joint from memory
+
+#ref CreateDistanceJoint CreateFrictionJoint CreateGearJoint CreateMotorJoint CreatePrismaticJoint CreatePulleyJoint CreateRevoluteJoint CreateWeldJoint CreateWheelJoint

doc/files/getspriteaabb.txt

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+#title GetSpriteAABB [RCBasic Doc]
+#header sub GetSpriteAABB( spr_id, ByRef x1, ByRef y1, ByRef x2, ByRef y2 )
+
+Returns the axis aligned bounding box for a sprite

doc/files/getspritedensity.txt

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+#title GetSpriteDensity [RCBasic Doc]
+#header function GetSpriteDensity( spr_id )
+
+Returns the density of a sprite. Higher density means a heavier sprite.
+
+#ref SetSpriteDensity

doc/files/getspritefriction.txt

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+#title GetSpriteFriction [RCBasic Doc]
+#header function GetSpriteFriction( spr_id )
+
+Returns a sprite's friction
+
+#ref GetSpriteFriction
+

doc/files/getspriterestitution.txt

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+#title GetSpriteRestitution [RCBasic Doc]
+#header function GetSpriteRestitution( spr_id )
+
+Returns the restitution coefficient for a sprite
+
+#ref SetSpriteRestitution

doc/files/getspriterestitutionthreshold.txt

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+#title GetSpriteRestitutionThreshold [RCBasic Doc]
+#header function GetSpriteRestitutionThreshold( spr_id )
+
+Returns the restitution velocity threshold for a sprite
+
+#ref SetSpriteRestitutionThreshold

doc/files/getworld2dautoclearforces.txt

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+#title GetWorld2DAutoClearForces [RCBasic Doc]
+#header function GetWorld2DAutoClearForces()
+
+Returns the auto clear forces flag for the active canvas
+
+#ref SetWorld2DAutoClearForces

doc/files/getworld2dpositioniterations.txt

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+#title GetWorld2DPositionIterations [RCBasic Doc]
+#header function GetWorld2DPositionIterations()
+
+Returns the number of position iterations for the position constraint solver
+
+#ref SetWorld2DPositionIterations
+

doc/files/getworld2dtimestep.txt

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+#title GetWorld2DTimeStep [RCBasic Doc]
+#header function GetWorld2DTimeStep()
+
+Returns the timestep for the active canvas
+
+#ref SetWorld2DTimeStep

doc/files/getworld2dvelocityiterations.txt

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+#title GetWorld2DVelocityIterations [RCBasic Doc]
+#header function GetWorld2DVelocityIterations()
+
+Returns the number of velocity iterations for the velocity constraint solver
+
+#ref SetWorld2DVelocityIterations

doc/files/getworld3dmaxsubsteps.txt

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+#title GetWorld3DMaxSubSteps [RCBasic Doc]
+#header function GetWorld3DMaxSubSteps()
+
+Returns the maximum substeps in the 3d physics time step
+

doc/files/getworld3dtimestep.txt

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+#title GetWorld3DTimeStep [RCBasic Doc]
+#header function GetWorld3DTimeStep()
+
+Returns the timestep of the 3d physics simulation

doc/files/setspritedensity.txt

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+#title SetSpriteDensity [RCBasic Doc]
+#header sub SetSpriteDensity( spr_id, density )
+
+Sets the density of a sprite. Higher density means a heavier sprite.
+
+Density is used to calculate mass for a sprite.
+
+#ref GetSpriteDensity
+

doc/files/setspritefriction.txt

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+#title SetSpriteFriction [RCBasic Doc]
+#header sub SetSpriteFriction( spr_id, friction )
+
+Sets a sprite's friction
+
+#ref GetSpriteFriction

doc/files/setspriterestitution.txt

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+#title SetSpriteRestitution [RCBasic Doc]
+#header sub SetSpriteRestitution( spr_id, restitution )
+
+Sets the restitution coefficient for a sprite
+
+#ref GetSpriteRestitution
+

doc/files/setspriterestitutionthreshold.txt

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+#title SetSpriteRestitutionThreshold [RCBasic Doc]
+#header sub SetSpriteRestitutionThreshold( spr_id, threshold )
+
+Sets the restitution threshold for a sprite.
+
+#ref GetSpriteRestitutionThreshold

doc/files/setworld2dautoclearforces.txt

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+#title SetWorld2DAutoClearForces [RCBasic Doc]
+#header sub SetWorld2DAutoClearForces( flag )
+
+Sets the auto clear forces flag for the active canvas
+
+#ref GetWorld2DAutoClearForces

doc/files/setworld2dpositioniterations.txt

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+#title SetWorld2DPositionIterations [RCBasic Doc]
+#header sub SetWorld2DPositionIterations( p )
+
+Sets the number of position iterations for the position constraint solver
+
+#ref GetWorld2DPositionIterations

doc/files/setworld2dtimestep.txt

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+#title SetWorld2DTimeStep [RCBasic Doc]
+#header sub SetWorld2DTimeStep( ts )
+
+Sets the timestep for the active canvas
+
+#ref GetWorld2DTimeStep

doc/files/setworld2dvelocityiterations.txt

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+#title SetWorld2DVelocityIterations [RCBasic Doc]
+#header sub SetWorld2DVelocityIterations( v )
+
+Sets the number of velocity iterations for the velocity constraint solver
+
+#ref GetWorld2DVelocityIterations