Ocsmesh

updated deprecated unary_union to union_all

**functions added to ocsmesh.utilts:**
calc_el_angles(msht), for calculating the internal angles of each element (tri and quads)
order_mesh(msht_: returns the reordered mesh (counterclockwise)
quads_from_tri(msht): creates quads from triangular mesh


**Full Changelog**: https://github.com/noaa-ocs-modeling/OCSMesh/compare/v1.5.6...v1.5.7

Fixed the contour extraction error due to matplotlib deprecated functions


**Full Changelog**: https://github.com/noaa-ocs-modeling/OCSMesh/compare/v1.5.5...v1.5.6

What's Changed
* added triangulate_polygon_s
* filter_el_by_area
* create_patch_mesh
* clip_mesh_by_mesh
* create_mesh_from_mesh_diff
* merge_neighboring_meshes
* fix_small_el
* merge_overlapping_meshes

For addressing:
* 100
* merge of multiple meshes (e.g. river, ocean, and floodplain)


**Full Changelog**: https://github.com/noaa-ocs-modeling/OCSMesh/compare/v1.5.4...v1.5.5

What's Changed
* added cleanup_folded_bound_el by felicio93 in https://github.com/noaa-ocs-modeling/OCSMesh/pull/151

New Contributors
* felicio93 made their first contribution in https://github.com/noaa-ocs-modeling/OCSMesh/pull/151

**Full Changelog**: https://github.com/noaa-ocs-modeling/OCSMesh/compare/v1.5.3...v1.5.4

What's Changed
* Large DEM processing & Minor subsetting bugfix by SorooshMani-NOAA in https://github.com/noaa-ocs-modeling/OCSMesh/pull/132


**Full Changelog**: https://github.com/noaa-ocs-modeling/OCSMesh/compare/v1.5.2...v1.5.3