Feature-request, make readers pathlib compatible

[d2hydro]

The advantage of using Path-lib is that it comes with some handy and very frequently used methods. Common packages ((geo)pandas, rasterio, etc) support Path-objects.

E.g.
from pathlib import Path
delft3dfmpy_path = Path(r'd:\repositories\delft3dfmpy')
data_path = delft3dfmpy_path.joinpath('data')

If you supply a Path-object to the read_gml method one gets the following error as ogr.Open(gml_path) does not accept Path-objects.

suggested edit: ogr.Open(str(gml_path))

Current error:

---

RuntimeError Traceback (most recent call last)
in
3
4 # Branches
----> 5 hydamo.branches.read_gml(data_path.joinpath('gml/hydroobject.gml'), index_col='code', clip=hydamo.clipgeo)
6 hydamo.branches['ruwheidstypecode'] = 4
7

C:\Anaconda3\envs\delft3dfmpy\lib\site-packages\delft3dfmpy\datamodels\common.py in read_gml(self, gml_path, index_col, groupby_column, order_column, column_mapping, check_columns, check_geotype, clip)
177
178 ogr.UseExceptions()
--> 179 gml = ogr.Open(gml_path)
180 layer = gml.GetLayer()
181 layerDefinition = layer.GetLayerDefn()

C:\Anaconda3\envs\delft3dfmpy\lib\site-packages\osgeo\ogr.py in Open(*args, **kwargs)
7798 def Open(*args, **kwargs):
7799 """Open(char const * utf8_path, int update=0) -> DataSource"""
-> 7800 return _ogr.Open(*args, **kwargs)
7801
7802 def OpenShared(*args, **kwargs):

RuntimeError: not a string