plugin interface: some minor changes

[Peter Zelezny <zed@linux.com>]

Hi All,

In the latest 1.9.x snapshot I posted, there were some minor changes
to the plugin interface. If you are developing plugins, you might need to
make adjustments.

1) No more (void *). There are new types for xchat_hook and xchat_context.
   (i.e. xchat_hook_command returns an (xchat_hook *)).
   This gives you some extra type checking when compiling.

2) server/command/print callbacks must now return one of:
#define EAT_NONE	(0)	/* pass it on through! */
#define EAT_XCHAT	(1)	/* don't let xchat see this event */
#define EAT_PLUGIN	(2)	/* don't let other plugins see this event */
#define EAT_ALL		(EAT_XCHAT|EAT_PLUGIN)	/* don't let anything see this event */

3) Whening returning 0 (EAT_NONE!) from a command callback, the help text is
not printed. Instead, it keeps looking through the list of plugin hooks to
call. Basically, it now runs command-hooks exactly the same way as
print/server hooks.

4) It might be possible to write plugins in C++ (?).

Hopefully all good changes there right?

-- 
Peter Zelezny. <zed@linux.com>
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