Export of Building Dataframe

[c0nb4]

Is your feature request related to a problem? Please describe.
Export a building dataframe, where all relevant information are contained. This can also be the input for further simulation.

[c0nb4]

Need to integrate load function. Placeholder already exists with:

def import_building_data(self):
"""
Import building data from a csv file
"""
# TODO Implement this function to load advanced building data
pass