Large changes to inter-object interfaces + More

+ Created a new core interface (called RequestChainable) and applied it to most of the objects using a trait
+ Altered the `__construct()` and `fromJson()` methods of all model classes by replacing the second parameter ($apiRequester) with a $caller parameter
+ Altered the  `__construct()` method of all requester classes to make them accept $client by reference instead of by value
+ Altered the  `__construct()` method of all requester classes by replacing the second parameter ($authToken) with a $caller parameter
+ Changed the name of several methods and properties
+ Altered several docblocks

src/Core/Interfaces/RequestChainableInterface.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace Gitea\Core\Interfaces;
+
+/**
+ * Interface that allows the tracking of request heirarchies
+ *
+ * @author Benjamin Blake (sitelease.ca)
+ */
+interface RequestChainableInterface
+{
+    /**
+     * Get the object that called this method
+     *
+     * @author Benjamin Blake (sitelease.ca)
+     *
+     * @return object|null
+     */
+    public function getCaller(): ?object;
+
+    /**
+     * Set the object that called this method
+     *
+     * @author Benjamin Blake (sitelease.ca)
+     *
+     * @return self
+     */
+    public function setCaller($object): self;
+
+    /**
+     * Return the request chain heirarchy
+     * as an array of objects
+     *
+     * This is useful if you need to know
+     * what objects where called in order to
+     * get the current object
+     *
+     * @author Benjamin Blake (sitelease.ca)
+     *
+     * @return array
+     */
+    public function getRequestChain(): array;
+
+
+    /**
+     * Return the request chain heirarchy
+     * as a string of class names
+     *
+     * This is useful if you need to quickly print out
+     * a breadcrumb like heirarchy of callers
+     *
+     * @author Benjamin Blake (sitelease.ca)
+     * @return array
+     */
+    public function debugRequestChain(): string;
+}