STAMR3Deregister* optimizations. Relevant for both startup and shutdown times.

PDMAsyncCompletion: PVM -> PUVM (one instance), internalize internal APIs where possible (not all because of test cases). API docs lives where the implmentation lives, NOT in headers (IPRT is the exception).

AsyncCompletion: New statistics counter to record 8KB unaligned accesses

AsyncCompletion: STAT_* => STAT_REL_*

AsyncCompletion: More statistics and include them in a release build (configurable through CFGM, default is disabled)

Doxygen.

Doxygen, comment typos.

Doxygen.

Introduced VBOX_WITH_REM in Config.kmk and the VMM.

Don't use Xchg when just writing.

VMM: -Wunused-parameter

VMM,IPRT: -Wunused-function.

PDMAsyncCompletion.cpp: Addressed out of bound indexing of StatTaskRunTimesSec and did some code cleanup reducing the file by some 110+ lines.

AsyncCompletion: Add a new flag to enable the host cache, to make using bandwidth groups possible for buffered I/O

VMM reorg: Moving the public include files from include/VBox to include/VBox/vmm.

VMM source reorg.