Update Protobuf and add protos for CS2 (#176)

* Replace protobuf 2.6.1 with 3.21.8

* Update/add protobuf libs

* Add CS2 protos

* Remove old csgo/dota protos

* Add versioned protoc bin

* Comment out Valve's `schema` define for now

* Use ENetworkDisconnectionReason

* Fix-up `offsetof` to avoid errors on some Clang versions

thirdparty/protobuf-3.21.8/python/google/protobuf/pyext/scoped_pyobject_ptr.h

@@ -0,0 +1,101 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: tibell@google.com (Johan Tibell)
+
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_SCOPED_PYOBJECT_PTR_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_SCOPED_PYOBJECT_PTR_H__
+
+#include <google/protobuf/stubs/common.h>
+
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+namespace google {
+namespace protobuf {
+namespace python {
+
+// Owns a python object and decrements the reference count on destruction.
+// This class is not threadsafe.
+template <typename PyObjectStruct>
+class ScopedPythonPtr {
+ public:
+  // Takes the ownership of the specified object to ScopedPythonPtr.
+  // The reference count of the specified py_object is not incremented.
+  explicit ScopedPythonPtr(PyObjectStruct* py_object = nullptr)
+      : ptr_(py_object) {}
+
+  // If a PyObject is owned, decrement its reference count.
+  ~ScopedPythonPtr() { Py_XDECREF(ptr_); }
+
+  // Deletes the current owned object, if any.
+  // Then takes ownership of a new object without incrementing the reference
+  // count.
+  // This function must be called with a reference that you own.
+  //   this->reset(this->get()) is wrong!
+  //   this->reset(this->release()) is OK.
+  PyObjectStruct* reset(PyObjectStruct* p = nullptr) {
+    Py_XDECREF(ptr_);
+    ptr_ = p;
+    return ptr_;
+  }
+
+  // Releases ownership of the object without decrementing the reference count.
+  // The caller now owns the returned reference.
+  PyObjectStruct* release() {
+    PyObject* p = ptr_;
+    ptr_ = nullptr;
+    return p;
+  }
+
+  PyObjectStruct* get() const { return ptr_; }
+
+  PyObject* as_pyobject() const { return reinterpret_cast<PyObject*>(ptr_); }
+
+  // Increments the reference count of the current object.
+  // Should not be called when no object is held.
+  void inc() const { Py_INCREF(ptr_); }
+
+  // True when a ScopedPyObjectPtr and a raw pointer refer to the same object.
+  // Comparison operators are non reflexive.
+  bool operator==(const PyObjectStruct* p) const { return ptr_ == p; }
+  bool operator!=(const PyObjectStruct* p) const { return ptr_ != p; }
+
+ private:
+  PyObjectStruct* ptr_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ScopedPythonPtr);
+};
+
+typedef ScopedPythonPtr<PyObject> ScopedPyObjectPtr;
+
+}  // namespace python
+}  // namespace protobuf
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_SCOPED_PYOBJECT_PTR_H__