Introducing IContainer into public api

lib/public/core/icontainer.php

+<?php
+
+namespace OCP\Core;
+
+/**
+ * Class IContainer
+ *
+ * IContainer is the basic interface to be used for any internal dependency injection mechanism
+ *
+ * @package OCP\Core
+ */
+interface IContainer {
+
+	function query($name);
+
+	function registerParameter($name, $value);
+
+	function registerService($name, \Closure $closure, $shared = true);
+}