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/lib/everest/crc/src/crc.cpp

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2020 - 2025 Pionix GmbH and Contributors to EVerest
+
+#include <cstdint>
+#include <everest/crc/crc.hpp>
+
+std::uint16_t calculate_xModem_crc16(const std::vector<std::uint8_t>& message) {
+    std::uint16_t crc = 0;
+
+    if (message.size() < 2) {
+        return 0;
+    }
+
+    for (const auto& message_item : message) {
+        crc ^= static_cast<std::uint16_t>(message_item) << 8;
+        for (std::uint16_t i = 0; i < 8; i++) {
+            if (crc & 0x8000) {
+                crc = (crc << 1) ^ 0x1021;
+            } else {
+                crc <<= 1;
+            }
+        }
+    }
+
+    return crc;
+}