Visualization Improvments

[yampelo]

• Better display of PCAP Payloads. Similar to follow TCP stream in wireshark
  

#66 Fixes bytes preventing saving pcap graph
#65 Fixes blank edges crashing GUI.

[codecov]

Codecov Report

Merging #63 into master will increase coverage by 0.01%.
The diff coverage is 92.3%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
+ Coverage   78.26%   78.28%   +0.01%     
==========================================
  Files          50       50              
  Lines        2655     2662       +7     
==========================================
+ Hits         2078     2084       +6     
- Misses        577      578       +1

Impacted Files	Coverage Δ
beagle/transformers/pcap_transformer.py	100% <100%> (ø)	⬆️
beagle/datasources/pcap.py	98.18% <88.88%> (-1.82%)	⬇️

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