Add the system.listMethods RPC method.

Still to implement:

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

include/modules/rpc.h

@@ -21,6 +21,9 @@ namespace RPC
 	class ServiceInterface;
 	class Value;
 
+	/** Represents a list of registered events. */
+	using Events = Anope::map<Event *>;
+
 	/** Represents possible types of RPC value. */
 	using ValueUnion = std::variant<Array, Map, Anope::string, std::nullptr_t, bool, double, int64_t, uint64_t>;
 
@@ -194,6 +197,8 @@ public:
 	{
 	}
 
+	virtual const Events &GetEvents() = 0;
+
 	virtual bool Register(Event *event) = 0;
 
 	virtual bool Unregister(Event *event) = 0;