[WIP] Comma split for .sym enumerations

[altendky]

#462

[codecov-io]

Codecov Report

Merging #463 into development will increase coverage by 0.01%. The diff coverage is 0%.

@@               Coverage Diff               @@
##           development     #463      +/-   ##
===============================================
+ Coverage         59.3%   59.31%   +0.01%     
===============================================
  Files               45       45              
  Lines             8121     8121              
  Branches          1790     1790              
===============================================
+ Hits              4816     4817       +1     
  Misses            2927     2927              
+ Partials           378      377       -1

Impacted Files	Coverage Δ
src/canmatrix/formats/sym.py	45.73% <0%> (ø)	:arrow_up:
src/canmatrix/formats/dbc.py	72.45% <0%> (+0.14%)	:arrow_up:

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