Building Model Spreadsheet export

[c0nb4]

Is your feature request related to a problem? Please describe.

Currently, districtgenerator creates both a building model, as well as simulating it. It would be good, to seperate these two parts. By enabling the export of a csv, dbf, JSON, xlsx or any other kind of file, the default buildings can be exported, changed and loaded into the simulation again.

This also highlights the model understanding.

Describe the solution you'd like

After building creation, an export should take place.

Describe alternatives you've considered
Leave it the way it is.

Additional context
This feature would help moving the districtgenerator to a better simulation tool, by providing both a visual approach, as well as the concept to exchange data over time.