Add the system.listMethods RPC method.

Still to implement:

- system.getCapabilities
- system.methodHelp
- system.methodSignature

modules/rpc/jsonrpc.cpp

@@ -26,7 +26,7 @@ class MyJSONRPCServiceInterface final
 	, public HTTPPage
 {
 private:
-	Anope::map<RPC::Event *> events;
+	RPC::Events events;
 
 	static void SendError(HTTPReply &reply, int64_t code, const Anope::string &message, const Anope::string &id)
 	{
@@ -86,6 +86,11 @@ public:
 	{
 	}
 
+	const RPC::Events &GetEvents() override
+	{
+		return events;
+	}
+
 	bool Register(RPC::Event *event) override
 	{
 		return this->events.emplace(event->GetEvent(), event).second;