Fix module event prioritization which was broken with the newer

auto-attach event stuff.

Also remove logically dead code from os_defcon, and make os_defcon akill
similar masks to os_session when enforcing session akills.

Fixes #1618 which relies on os_session to be prioritized before
os_defcon.

src/module.cpp

@@ -101,6 +101,10 @@ void Module::SetAuthor(const Anope::string &nauthor)
 	this->author = nauthor;
 }
 
+void Module::Prioritize()
+{
+}
+
 ModuleVersion::ModuleVersion(int maj, int min, int pa) : version_major(maj), version_minor(min), version_patch(pa)
 {
 }

src/modulemanager.cpp

@@ -265,6 +265,8 @@ ModuleReturn ModuleManager::LoadModule(const Anope::string &modname, User *u)
 	for (unsigned i = 0; i < I_SIZE; ++i)
 		EventHandlers[i].push_back(m);
 
+	m->Prioritize();
+
 	FOREACH_MOD(OnModuleLoad, (u, m));
 
 	return MOD_ERR_OK;