Add extracted tools: CitrineOS, OpenOCPP, ShapeShifter

- CitrineOS core extracted (CSMS OCPP 2.0.1)
- OpenOCPP extracted (firmware OCPP 1.6J/2.0.1)
- ShapeShifter library installed (pip install -e)
- ShapeShifter specification extracted
- EVerest extracted

TODO updated with progress

tools/EVerest-main/modules/EVSE/EvseManager/VarContainer.hpp

@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright Pionix GmbH and Contributors to EVerest
+#ifndef VARCONTAINER_HPP
+#define VARCONTAINER_HPP
+
+#include <chrono>
+#include <condition_variable>
+#include <mutex>
+
+/*
+ Simple helper class for a thread safe single producer / single consumer pattern
+ with a queue size of one.
+*/
+
+template <class T> class VarContainer {
+public:
+    T& operator=(T d) {
+        {
+            std::scoped_lock lock(data_mutex);
+            data = d;
+            unread_data = true;
+        }
+        condvar.notify_one();
+        return data;
+    };
+
+    void clear() {
+        std::scoped_lock lock(data_mutex);
+        unread_data = false;
+    };
+
+    bool wait_for(T& d, std::chrono::milliseconds timeout) {
+        std::unique_lock<std::mutex> lock(data_mutex);
+
+        if (condvar.wait_for(lock, timeout, [this] { return unread_data; })) {
+            unread_data = false;
+            d = data;
+            return true;
+        } else {
+            // Timeout occurred in wait_for
+            return false;
+        }
+    };
+
+private:
+    T data;
+    std::condition_variable condvar;
+    std::mutex data_mutex;
+    bool unread_data{false};
+};
+
+#endif