Obsfile path with spaces is not supported

[veenstrajelmer]

Describe the bug
When there is a space in an obsfile path, HYDROLIB-core raises a ValidationError since it only reads the path up to the space:

ValidationError: 4 validation errors for Output
obsfile -> 0
  File: `C:\DATA\dfm_tools\dfm_tools\Vietnam_model_forissue\Vietnam` not found, skipped parsing. (type=value_error)
obsfile -> 0

The path of the obsfile is C:\DATA\dfm_tools\tests\examples_workinprogress\Vietnam _model_forissue\Vietnam_obs.xyn

To Reproduce

# import packages
import os
import hydrolib.core.dflowfm as hcdfm

# user input
model_name = 'Vietnam'
dir_output = os.path.abspath(f'./{model_name} _model_forissue') #TODO: space in path will raise ValidationError
os.makedirs(dir_output, exist_ok=True)

# construct and save empty obsfile
file_obs = os.path.join(dir_output, f'{model_name}_obs.xyn')
obs_mod = hcdfm.ObservationPointModel()
obs_mod.save(file_obs)

# construct and save empty extfile (old)
file_ext_old = os.path.join(dir_output, f'{model_name}_old.ext')
ext_old_mod = hcdfm.ExtOldModel()
ext_old_mod.save(file_ext_old)

# construct and save empty extfile (new)
file_ext_new = os.path.join(dir_output, f'{model_name}_new.ext')
ext_new_mod = hcdfm.ExtModel()
ext_new_mod.save(file_ext_new)

# initialize mdu file and update settings
mdu = hcdfm.FMModel()
# setting the ext files will work fine
mdu.external_forcing.extforcefile = file_ext_old
mdu.external_forcing.extforcefilenew = file_ext_new
# setting the obs file raises "ValidationError: 4 validation errors for Output"
mdu.output.obsfile = file_obs

Additional information
I noticed that when supplying mdu.output.obsfile = obs_mod instead of mdu.output.obsfile = file_obs, it raises:

ValidationError: 1 validation error for Output
obsfile
  value is not a valid list (type=type_error.list)

And when supplying mdu.output.obsfile = [obs_mod] or of mdu.output.obsfile = [file_obs], there is no error and the process successfully continues.

Expected behavior
If a space is included, it will still work. Just like for files like ext files and such, since it works here. With the insight from the additional information: align the error message if a user supplies a filepath with the one that is raised when a user supplies a ObservationPointModel.

Version info (please complete the following information):

• OS: Windows
• Version: 0.7.0