New Repo for Qt5 Qt3D

As a developer or client of Qt3D I want to access Qt3D via the new "Qt3D" naming, at a master branch.

• Create a new repository on code review.qt-project.org named "qt/qt3d" using same details as for current qt/quick3d
  • This repo will have "master" pointing to the exact code from the qml2 branch of the current qt/quick3d repo
  • Message is "Qt3D provides support for scripting Qt Quick applications in 3D using OpenGL."
• Create corresponding repositories on bq-git.apac.nokia.com (the mirror) and scm.dev.nokia.troll.no (read-only source)
  • Test and make sure all repos are working
• Add the qt3d sub-module to the qt5 repo
• Change the init-repository script to pull from the new repo/s
• Change any other client projects that are pulling from the qml2 branch to use the new repo
• Test and confirm that compiles and functionality is all working
• Advertise via appropriate mails/announcements that the new repo is now the authoritative one for Qt3D