Improved core brain performance

[nk3nny]

Adds performance improvements to brains.sqf evaluation logic-- as well as the danger.fsm handling of variables.

Test Situations:

Two soldiers (t1 and t2) and an observer placed on Stratis.

Script run 10000 times, four times:

private _time = time + 2; 
[t1, [  
    [1, [2733.44,5782.12,2.65515], _time, player],  
    [8, [2885.58,5761.49,30.3456], _time, t2],  
    [6, [2740.27,5776.39,2.95648], _time, objNull],  
    [5, [2733.44,5782.12,2.65515], _time, player]  
]] call lambs_danger_fnc_brain;

UNMODIFIED

0.0131
0.0132
0.0134
0.0133

MODIFIED

0.0102
0.0099
0.0098
0.0100