Introducing VersionPatch base class for version files and minecraft versions

logic/minecraft/VersionPatch.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <memory>
+
+class VersionFinal;
+class VersionPatch
+{
+public:
+	virtual ~VersionPatch(){};
+	virtual void applyTo(VersionFinal *version) = 0;
+	virtual bool isVanilla() = 0;
+	virtual bool hasJarMods() = 0;
+};
+
+typedef std::shared_ptr<VersionPatch> VersionPatchPtr;