VBoxService/VBoxServiceControlSession.cpp: Added a to-do.

VBoxService/GuestCtrl: Print some more help in case a guest session is unable to start. This most likely is the case when the specified guest user can't create/write the log file into the desired directory.

Guest Control: - Implemented IGuestSession::DirectoryRemove, IGuestSession::DirectoryRemoveRecursive, IGuestSession::DirectoryRename + IGuestSession::FileRename. - Added appropriate commands to VBoxManage (basic support for now). - Implemented support for proper guest session process termination via SCM. - Implemented support for internal anonymous wait events which are not relying on the public API's VBoxEventType_T. - Various bugfixes.

IPRT: Filename extension versus suffix cleanup, long overdue.

VBoxService/GuestCtrl: Only write desired amount to guest files, debug logging.

VBoxService/VBoxServiceControlSession: Logging.

VBoxService/VBoxServiceControlSession: Close guest file on opening error.

GuestCtrl/IGuestFile: Fixed initial offset reporting when using IGuestSession::openFileEx().

VBoxService/VBoxServiceControlSession.cpp: Fixed logging / shadowed variables.

GuestCtrl: Update for IGuestFile; some renaming.

Additions/GuestCtrl: Use a separate filter mask + value for message filtering.

VBoxService/GuestCtrl: More message filtering for guest session + process threads; message processing not needed there, logging.

GuestCtrl: Fixed per-session command filtering, added command to disable the filter again.

VBoxService/GuestCtrl: Re-added (optional debug) dumping of guest process streams, now as a (forked) per-session option.

VBoxService/GuestCtrl: Implemented asynchronous request queue, bugfixes.

Comment typo.

GuestCtrl: Various bugfixes required for test driver to pass.

VBoxService/GuestCtrl: Added asynchronous request handling, more fixes for testcases.

GuestCtrl: Implemented using (public) VirtualBox events instead of own callback mechanisms. Bugfixes for testcases (still work in progress).

GuestCtrl: More stuff for IGuestFile and IGuestSession handling (work in progress).

GuestCtrl: *_NOTFIY_* -> *_NOTIFY_*.

GuestCtrl: More code for guest session infrastructure handling (untested, work in progress).

VBoxService/GuestCtrl: More code (revamp) for dedicated guest session handling. Untested, work in progress.

GuestCtrl: More code for guest session infrastructure handling (untested, work in progress). Added IGuestSession.status for (later) asynchronous handling.

Additions/VBoxServices: two warnings

Build fix.

GuestCtrl: Infrastructure changes for handling and executing dedicated guest sessions and protocol versioning (untested, work in progress).