Removed tests from py-pkg | no open files after parsing

[nobbi1991]

Brief

I fixed a few bugs / "not-so-nice-things" during my first use of your library:

• Removed the tests folder from the python package
• Used everywhere with open() where files where opened to avoid opened files

Checklist

• [ ] Add relevant labels to the Pull Request
• [x] Review test results and code coverage
  • [x] Review snapshot test results for deviations
• [x] Review code changes
  • [ ] Create relevant test scenarios
  • [ ] Update examples
  • [ ] Update JSON schema
• [ ] Update documentation
  • [ ] Update examples in README
• [x] Update changelog
• [x] Update version number

Resolves

• Import from own tests folder is possible
• No open files after .ldf parsing

Evidence

• Analyze how the change might impact existing code -> there should be no impact

• Provide evidence that the feature is tested and covered properly -> tested the change with my implementation

[codecov[bot]]

Codecov Report

Merging #113 (7363b89) into master (094da17) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #113   +/-   ##
=======================================
  Coverage   96.05%   96.06%           
=======================================
  Files          13       13           
  Lines        1317     1320    +3     
=======================================
+ Hits         1265     1268    +3     
  Misses         52       52           

Flag	Coverage Δ
3.10.0b1	96.06% <100.00%> (+<0.01%)	:arrow_up:
3.6	96.05% <100.00%> (+<0.01%)	:arrow_up:
3.7	96.05% <100.00%> (+<0.01%)	:arrow_up:
3.8	96.05% <100.00%> (+<0.01%)	:arrow_up:
3.9	96.05% <100.00%> (+<0.01%)	:arrow_up:
unittests	96.06% <100.00%> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
ldfparser/parser.py	95.17% <100.00%> (+0.04%)	:arrow_up:

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