Add support for an adaptive CLI greeting
Robert Sprowson authored
ShellCLI already supports setting CLI$Prompt to replace the '*' with something else.
Now, the initial greeting ("Press return to get back to the desktop") can also be replaced by setting CLI$Greeting, for example "Session started <Sys$Time>".
* Read the default greeting from the messages at init
* Expand the variable and prettyprint it on starting a new ShellCLI instance
* Remove use of International_Help bitfield as an assembly time switch
* Made the "can't kill ShellCLI" and "can't start ShellCLI" have two different error messages
* Use Command macro, and own header file

Version 0.36. Tagged as 'ShellCLI-0_36'
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