New commands: hide/unhide actions,

New commands: hide/unhide actions,
upcase/downcase literals.
(antlr-tiny-action-length): New user option.
(antlr-hide-actions): New command.  Suggested by
Bjoern Mielenhausen <Bjoern.Mielenhausen@sap.com>.
(antlr-mode-map): New binding [C-c C-v].
(antlr-mode-menu): New entries.
(antlr-downcase-literals): New command.
(antlr-upcase-literals): Ditto.

Minor changes: indendation, mode-name.
(antlr-indent-line): Indent cpp directive at column 0.
(antlr-mode): Use mode-name prefix "Antlr." instead of "Antlr/".

XEmacs bug workaround, XEmacs hint.
(antlr-font-lock-additional-keywords): Workaround for intentional
bug in XEmacs version of font-lock.
(antlr-mode): Set symbol property `mode-name' to "Antlr".  Could
be used by a smarter version of `buffers-menu-grouping-function'.