Install VBoxDTrace scripts/libs/testcases.
Installer/linux: add vbox-img
Installer: add VBoxHostChannel service library.
enabled shared clipboard support for Linux hosts (guest=>host only)
Moved VBox/x86.h/mac to iprt/x86.h/mac.
VRDPAuth -> VBoxAuth.
generalized and moved auth modules
more branding and header fixes
Linux installer: export some files