Allow custom model directory

[MaHaWo]

closes #53

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 20.96774% with 49 lines in your changes missing coverage. Please review.

Project coverage is 78.68%. Comparing base (2dcd633) to head (574ed1d).
Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
src/faunanet/repl.py	8.00%	46 Missing ⚠️
src/faunanet/watcher.py	72.72%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
- Coverage   82.50%   78.68%   -3.82%     
==========================================
  Files          10       10              
  Lines         983     1037      +54     
  Branches      182      191       +9     
==========================================
+ Hits          811      816       +5     
- Misses        134      182      +48     
- Partials       38       39       +1     

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[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud