This is done in preparation for moving all this functionality in a
separate KDTERM "KD Terminal Driver" DLL.
Additionally:
- Flush the terminal input before sending ANSI escape sequences.
- In KDBG pager, always use the correct reading-key function (the
same used also for reading keys for a line of user input), and not
the simplistic two-call KdbpGetCharSerial + KdbpTryGetCharSerial
that would split the \r \n across calls.
- Call KdbpGetCommandLineSettings() in KdbInitialize() at BootPhase 0,
which is indirectly called by KdDebuggerInitialize0(). And fix its
command-line parsing too.
