Moved enmap-box, sicor and enpt download from...

Moved enmap-box, sicor and enpt download from build_enpt_enmapboxapp_testsuite_image.sh to new before_script.sh and adjusted 'make gitlab_CI_docker' accordingly. Updated version info.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>