RC4_Update pset issues

When going over the RC4_Update psets I found the following issues:

1. No SingleValue DataType: Pset_CivilElementCommon.Reference
2. No SingleValue DataType: Pset_ElementAssemblyCommon.Reference
3. No SingleValue DataType: Pset_FurnitureTypeCommon.Reference
4. No SingleValue DataType: Pset_RampCommon.LoadBearing
5. No SingleValue DataType: Pset_RampCommon.ThermalTransmittance
6. No SingleValue DataType: Pset_RoadMarkingCommon.MaterialColour
7. No SingleValue DataType: Pset_RoofCommon.LoadBearing
8. No SingleValue DataType: Pset_SpatialZoneCommon.Reference
9. No SingleValue DataType: Pset_StairCommon.LoadBearing
10. No SingleValue DataType: Pset_StairCommon.ThermalTransmittance
11. No templatetype: Pset_BoreholeCommon
12. No templatetype: Pset_BridgeCommon
13. No templatetype: Pset_CivilElementCommon
14. No templatetype: Pset_ElementAssemblyCommon
15. No templatetype: Pset_GeotechnicalAssemblyCommon
16. No templatetype: Pset_GeotechnicalStratumCommon
17. No templatetype: Pset_LinearReferencingMethod
18. No templatetype: Pset_MaintenanceStrategy
19. No templatetype: Pset_MarineFacilityTransportation
20. No templatetype: Pset_MarkingLinesCommon
21. No templatetype: Pset_MobileTelecommunicationsApplianceTypeCommon
22. No templatetype: Pset_PavementCommon
23. No templatetype: Pset_PlantCommon
24. No templatetype: Pset_ReferentCommon
25. No templatetype: Pset_RoadGuardElement
26. No templatetype: Pset_RoadMarkingCommon
27. No templatetype: Pset_RoadSymbolsCommon
28. No templatetype: Pset_SensorTypeFrostSensor
29. No templatetype: Pset_SensorTypeIdentifierSensor
30. No templatetype: Pset_SolidStratumCapacity
31. No templatetype: Pset_SolidStratumComposition
32. No templatetype: Pset_SpatialZoneCommon
33. No templatetype: Pset_Stationing
34. No templatetype: Pset_SumpBusterCommon
35. No templatetype: Pset_TrafficCalmingDeviceCommon
36. No templatetype: Pset_Uncertainty
37. No templatetype: Pset_WaterStratumCommon
38. Templatetype QTO_TYPEDRIVENOVERRIDE: Pset_MarineVehicleCommon

So 3 categories of issues:

* Missing underlying type for TypePropertySingleValue

Most of these I can figure out myself in the migration. LoadBearing is obviously a bool. A bit surpised perhaps to see Pset_(Stair|Ramp)Common.LoadBearing and Pset_RampCommon.ThermalTransmittancebut but those are not 4x3 issues I suppose.

Should MaterialColour be a reference property to a IfcColourRGB instead?

* Missing template type (PSET_OCCURRENCEDRIVEN, PSET_PERFORMANCEDRIVEN, PSET_TYPEDRIVENOVERRIDE)

If we can agree on some default (maybe there already is, I don't know) then it's not an issue I assume, unless you feel like these psets should deviate from that default

* Pset_MarineVehicleCommon has a template type of QTO_TYPEDRIVENOVERRIDE, I doubt that can be correct, but perhaps it is?