Validation errors when parsing .mdu file - types of certain keywords need to be changed

[JulienGroenenboom]

Describe the bug
I get validation errors (type_error's) when loading some of my *.mdu files.

I think some changes are needed in: hydrolib.core.io.mdu.models.py

[physics]
umodLin ; type should be float instead of int to avoid the validation error # Note that based on the D-Flow FM manual, you might expect an integer. However, in D-Flow FM this is read as a float. Change needed in HYDROLIB-core or in D-Flow FM?
betaSpiral ; type should be float instead of int

[trachytopes]
TrtL ; type should be [str] instead of [int]
TrtDef ; type should be [str] instead of [int]

[wind]
relativewind ; type should be float instead of bool # this recently changed in D-Flow FM from boolean to float

[priscavdsluis]

Hi @arthurvd, as discussed, could you update the manual for the 5 keywords?