Fixing Notes, so they correctly parse NVTs, Refactor some code, tests

[y0urself]

What:

Why:

How:

Checklist:

• Tests
• CHANGELOG Entry
• Documentation

[codecov]

Codecov Report

Merging #15 (59abdf9) into master (d57ed5e) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage   97.07%   97.13%   +0.05%     
==========================================
  Files         121      121              
  Lines        7258     7233      -25     
==========================================
- Hits         7046     7026      -20     
+ Misses        212      207       -5     

Impacted Files	Coverage Δ
selene/schema/nvts/queries.py	98.80% <ø> (ø)
selene/schema/notes/fields.py	95.12% <100.00%> (+5.72%)	⬆️
selene/schema/nvts/fields.py	96.62% <100.00%> (ø)

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