Similar to configFile and missionConfigFile, but instead pulls from the currently loaded mission.sqm.

Currently you can sort of do this via

class MissionSQM
{
	#include "mission.sqm"
};

which allows you to do

getNumber (missionConfigFile >> "MissionSQM" >> "version");

(See Killzone Kids note here: https://community.bistudio.com/wiki/missionConfigFile)

This of course requires you to do some setup in the description.ext, and doesn't work if you binarise the mission.sqm (see T77479).