Add image extraction status for TwoPassWindowSum

[HealthyPear]

Closes #161

• Add dev code for newer version of TwoPassWindowSum
• Update event_preparer.py
• Update TRAINING and DL2 scripts
• Update documentation

[codecov]

Codecov Report

Merging #163 (9215680) into master (0a7495f) will increase coverage by 1.07%.
The diff coverage is 86.18%.

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
+ Coverage   66.11%   67.19%   +1.07%     
==========================================
  Files          24       24              
  Lines        2402     2545     +143     
==========================================
+ Hits         1588     1710     +122     
- Misses        814      835      +21     

Impacted Files	Coverage Δ
protopipe/scripts/write_dl2.py	81.11% <ø> (ø)
protopipe/pipeline/event_preparer.py	65.02% <76.92%> (-0.17%)	⬇️
protopipe/pipeline/temp.py	89.55% <86.95%> (-1.95%)	⬇️
protopipe/scripts/data_training.py	92.13% <100.00%> (+0.03%)	⬆️

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