fix CBA_fnc_getPos

[commy2]

When merged this pull request will:

• fix CBA_fnc_getPos reporting true instead of a position in certain cases
• solves CBA_fnc_taskPatrol, CBA_fnc_addWaypoint etc. not working correctly
• solves getting stuck in loading screen when using ALiVE
• adds unit test for CBA_fnc_getPos

execVM "\x\cba\addons\common\test_position.sqf";

14:00:51 [CBA] (common) Test OK: (CBA_fnc_getPos is defined) x\cba\addons\common\test_position.sqf:11
14:00:51 [CBA] (common) Test OK: (_result isEqualTo [0,0,0]) x\cba\addons\common\test_position.sqf:17
14:00:51 [CBA] (common) Test OK: (_result isEqualTo [0,0,0]) x\cba\addons\common\test_position.sqf:24
14:00:51 [CBA] (common) Test OK: (_result isEqualTo [0,0,0]) x\cba\addons\common\test_position.sqf:31
14:00:51 [CBA] (common) Test OK: (_result isEqualTo [0,0,0]) x\cba\addons\common\test_position.sqf:38
14:00:51 [CBA] (common) Test OK: (_result isEqualTo [1,2,0] ) x\cba\addons\common\test_position.sqf:50
14:00:51 [CBA] (common) Test OK: (_result isEqualTo [1,2] ) x\cba\addons\common\test_position.sqf:62