shared.dataInput:

Added shared.enums.XMLFileType, which is used to specify if a string contains a file path or file contents.
Updated the XML readers to use it.

Testing:
Moved the networking tests and resources into racevisionGame module.
Moved the remaining tests from visualiser into racevisionGame, and added a few empty tests to implement later.

racevisionGame/src/main/java/shared/enums/XMLFileType.java

@@ -0,0 +1,24 @@
+package shared.enums;
+
+/**
+ * Represents the various ways in which we want to open/read an xml file - e.g., a string may contain the file contents, or the file path.
+ */
+public enum XMLFileType {
+
+    /**
+     * This means that a provided string contains the contents of an XML file.
+     */
+    Contents,
+
+    /**
+     * This means that a provided string contains the path to an XML file.
+     */
+    FilePath,
+
+    /**
+     * This means that a provided string contains the path, to be loaded as a resource, of an XML file.
+     */
+    ResourcePath;
+
+
+}