corrected text in vcmibuilder, corrected errors and warnings from cppcheck

snprintf is a secure way to do sprintf.

Changes related to CRmgTemplateZone.cpp should be reviewed by DjWarmonger, it was probably a copy-paste error or a dead logic code.

Text in vcmibuilder was a bit outdated.

Please have a look at the lines above. There is already such code:
if (creaturesAmount <= 5)
			{
				creaturesAmount = boost::math::round(creaturesAmount); //allow single monsters
				if (creaturesAmount < 1)
					continue;
			}
			else if (creaturesAmount <= 12)
			{
				(creaturesAmount /= 2) *= 2;
			}
			else if (creaturesAmount <= 50)
			{
				creaturesAmount = boost::math::round(creaturesAmount / 5) * 5;
			}
			else if (creaturesAmount <= 120) // it was 12 before!
			{
				creaturesAmount = boost::math::round(creaturesAmount / 10) * 10;
			}