Configure 'template_path' and 'static_path' locations via command line arguments

[muurk]

Added command line arguments to enable the user to specify an alternative location to load 'templates' and 'static' artefacts.

[codecov-commenter]

Codecov Report

Merging #177 into master will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
- Coverage   94.06%   93.95%   -0.11%     
==========================================
  Files           6        8       +2     
  Lines         724      827     +103     
  Branches      120      141      +21     
==========================================
+ Hits          681      777      +96     
- Misses         29       34       +5     
- Partials       14       16       +2     

Impacted Files	Coverage Δ
webssh/settings.py	100.00% <100.00%> (ø)
webssh/handler.py	96.19% <0.00%> (-0.72%)	⬇️
webssh/__init__.py	100.00% <0.00%> (ø)
webssh/utils.py	95.95% <0.00%> (ø)

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