Catch some bugs when bad mesh files are used in dtocean-wec

[H0R5E]

• Renamed dtocean_wec.submodule.utils.mesh_util module as dtocean_wec.submodule.utils.mesh and refactored.
• Fixed bugs that occur if opening wrong type of mesh file in dtocean-wec.

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✅ Build dtocean-hydrodynamics 3.1.1.build73 completed (commit 2091106316 by @H0R5E)

[codecov]

Codecov Report

Merging #14 (e898730) into master (25bc9dd) will increase coverage by 1.81%.
The diff coverage is 96.33%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   38.47%   40.28%   +1.81%     
==========================================
  Files          93       93              
  Lines       11742    11656      -86     
  Branches     1429     1415      -14     
==========================================
+ Hits         4518     4696     +178     
+ Misses       7019     6754     -265     
- Partials      205      206       +1     

Impacted Files	Coverage Δ
dtocean_wec/tab2.py	19.60% <0.00%> (ø)
dtocean_wec/utils/mesh_class.py	6.08% <50.00%> (+0.46%)	⬆️
dtocean_wec/submodule/nemoh_run.py	19.88% <85.00%> (+8.77%)	⬆️
dtocean_wec/submodule/utils/mesh.py	98.96% <98.96%> (ø)

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