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BGE patch: KX_STATEx constant to allow simple state manipulation in setState()

The constants KX_STATE1 to KX_STATE30 can be used
with setState() to change the object state in a
python controller. The constants are defined in the
GameLogic module so that the full name is
GameLogic.KX_STATE1 to GameLogic.KX_STATE30 but you
can simplify this with the import statement:

from GameLogic import *
cont = getCurrentController()
ob = cont.getOwner()
ob.setState(KX_STATE2) #go to state 2

KX_STATEx constants are defined as (1<<(x-1))
Binary operators |, &, ^ and ~ can be used to combine states:

You can activate more than one state at a time with the | operator:

ob.setState(KX_STATE1|KX_STATE2) #activate state 1 and 2, stop all others

You can add a state to the current state mask with:

state = ob.getState()
ob.setState(state|KX_STATE3) #activate state 3, keep others

You can substract a state to the current state mask with the & and operator:

state = ob.getState()
ob.setState(state&~KX_STATE2) #stop state 2, keep others

You can invert a state with the ^ operator:

state = ob.getState()
ob.setState(state^KX_STATE2) #invert state 2, keep others