debugserver: adds new Live View grid that will track values.

The "live view" values are not added to the usual messages list. They
are very handy for tracking short lived debug info like the position
of a mouse cursor, position of a trackbar or scrollbar etc.
debugserver: LiveView frame now has a Grid property for easy access.
Deletes another old and outdated documentation.

This too was for v0.4 and earlier.
new debug interface unit for use with out Debug Server application.

Added debug interface units to 'corelib' and to the fpgui_toolkit packages
debugserver: Now support LiveView messages.

LiveView messages don't appear in the normal log message window. Instead
they appear in a separate non-scrolling grid where the previous values
get replaced with the new values.
Merge branch 'debugserver-liveview' into develop