added a lot of maths
Merge branch 'master' of https://github.com/tis-p30/Gbox

Conflicts:
	math/mth.cpp
	math/mth.h
Merge branch 'master' of https://github.com/tis-p30/Gbox

Conflicts:
	.gitignore
	Gbox.pro.user
	math/mth.cpp
	math/mth.h
added numerical integration functions