move vect.h and matr.h to namespace GuiderUtils
This cleanup MR isolates the old vect.h Vector class into a GuiderUtils namespace and also moves the old matr.h Ekos::Matrix class into GuiderUtils.
I used the clunky GuiderUtils::Vector throughout the code, instead of a "using GuiderUtils::Vector" shortcut, because this Vector really should be replaced at some point by QVector3D or something like that.