Support D-Water Quality input in ExtOldModel

[SCLaan]

Is your feature request related to a problem? Please describe.
At present when loading the old format ext file of a coupled D-Flow FM and D-Water Quality model multiple validation errors occur, because the water quality input is not yet supported.

Describe the solution you'd like
I would like to see support for water quality input in ExtOldModel. These errors occur for the following input under QUANTITY:

• waqfunctionXXX (with a user specified function, e.g. waqfunctionRadSurf, waqfunctionVWind)
• waqmassbalanceareaXXX (with a user specified domain name)
• waqparameterXXX (with a user specified parameter name)
• tracerbndXXX (in combination with FILETYPE=9)
• initialtracerXXX (in combination with FILETYPE=10)
• initialwaqbotXXX (in combination with FILETYPE=10)

Describe alternatives you've considered
none

Additional context
MWE:

from pathlib import Path
import hydrolib.core.dflowfm as hcdfm

ext_file = Path(r'p:\11208983-epd-support-tools\training\HK-DFM_Day3_WaterQuality\Demo_Model_Input\HK-FM_bnd.ext')
ext_data = hcdfm.ExtOldModel(ext_file)

[veenstrajelmer]

updated path:

import hydrolib.core.dflowfm as hcdfm
ext_file = r'p:\11208983-epd-support-tools\training\HK-DFM_June2023\HK-DFM_Day3_WaterQuality\Demo_Model_Input\HK-FM_bnd.ext'
ext_data = hcdfm.ExtOldModel(ext_file, recurse=False)

[tim-vd-aardweg]

Let's discuss the details @veenstrajelmer & @rhutten

[tim-vd-aardweg]

Assigned the issue to @rhutten. She will determine if/when we will pick up this issue.