core: add priority in plugins to initialize them in order

Current order is: charset, logger, exec, trigger, aspell, alias, fifo, xfer,
irc, relay, guile/lua/perl/python/ruby/tcl, script.

src/plugins/logger/logger.c

@@ -50,6 +50,7 @@ WEECHAT_PLUGIN_DESCRIPTION(N_("Log buffers to files"));
 WEECHAT_PLUGIN_AUTHOR("Sébastien Helleu <flashcode@flashtux.org>");
 WEECHAT_PLUGIN_VERSION(WEECHAT_VERSION);
 WEECHAT_PLUGIN_LICENSE(WEECHAT_LICENSE);
+WEECHAT_PLUGIN_PRIORITY(12000);
 
 struct t_weechat_plugin *weechat_logger_plugin = NULL;