Subset of Modelica Standard Library (https://github.com/modelica/ModelicaStandardLibrary, 4.0.0) that is
- required in rtc-tools
- parsable by pymoca>=0.10.0 (which no longer declares Modelica as a builtin type, see https://github.com/pymoca/pymoca/commit/cf6d6a3b259983afe6e9d43c079da33901f17e34 )