[Feature] read_xdf() - easily read and tidy up signals from Lab Streaming Layer (LSL) into a DataFrame

[DominiqueMakowski]

Note to those using the Muse EEG headband with LSL, if you want to synchronize it with LSL you'll need this branch: alexandrebarachant/muse-lsl#197

[codecov-commenter]

Codecov Report

Patch coverage: 17.50% and project coverage change: -0.11% ⚠️

Comparison is base (a802b57) 55.23% compared to head (e8f2d78) 55.13%.
Report is 6 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #874      +/-   ##
==========================================
- Coverage   55.23%   55.13%   -0.11%     
==========================================
  Files         297      298       +1     
  Lines       13917    13956      +39     
==========================================
+ Hits         7687     7694       +7     
- Misses       6230     6262      +32     

Files Changed	Coverage Δ
neurokit2/data/read_bitalino.py	15.09% <ø> (ø)
neurokit2/data/read_xdf.py	8.57% <8.57%> (ø)
neurokit2/bio/bio_process.py	56.25% <66.66%> (-0.17%)	⬇️
neurokit2/data/__init__.py	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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