allow dollar sign as another variant of ^[ (discard all arguments or return)

 * some classic TECOs have this
 * just like ^[, dollar works as a command only, not as a string terminator
 * it improves the readability of macros using printable characters only
 * it closes a gap in the language by allowing $$ (double-dollar) and
   ^[$ as printable ways to write the return from macro command.
   ^[^[ was not and is not possible.
 * since command line termination is a regular interactive return-command
   in SciTECO, double-dollar will also terminate the command line now.
   This will be allowed unless it turns out to be a cause of trouble.
 * The handling of unterminated commands has been cleaned up by
   introducing State::end_of_macro().
   Most commands (and thus states) except the start state cannot be
   valid at the end of a macro since this indicates an unterminated/incomplete
   command.
   All lookahead-commands (currently only ^[) will end implicitly
   at the end of a macro and so will need a way to perform their action.
   The virtual method allows these actions to be defined with the rest
   of the state's implementation.

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