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/openocpp/rapidjson/.gitmodules

@@ -0,0 +1,3 @@
+[submodule "thirdparty/gtest"]
+	path = thirdparty/gtest
+	url = https://github.com/google/googletest.git