drop shadowbuild + try to make sure we don't use Qt5 qmake

by checking for a qt4 qmake and using it if found.  we don't quite
work with qt5 and it seems to effect the build system,
unfortunately.

second, the build files *should* end up in a build dir already, so...

drop shadow build
stop building genlua, we do not need it.
just use root 'Tuvok.pro'.
ignore some more autogenned files.