[WIP] Convert sym parsing errors to ParsingErrors

[altendky]

[codecov-io]

Codecov Report

Merging #464 into development will increase coverage by 0.05%. The diff coverage is 71.42%.

@@               Coverage Diff               @@
##           development     #464      +/-   ##
===============================================
+ Coverage        59.30%   59.35%   +0.05%     
===============================================
  Files               45       45              
  Lines             8121     8134      +13     
  Branches          1790     1792       +2     
===============================================
+ Hits              4816     4828      +12     
- Misses            2927     2928       +1     
  Partials           378      378              

Impacted Files	Coverage Δ
src/canmatrix/formats/sym.py	46.29% <60.00%> (+0.55%)	:arrow_up:
src/canmatrix/tests/test_sym.py	96.00% <77.77%> (-4.00%)	:arrow_down:
src/canmatrix/formats/dbc.py	72.45% <0.00%> (+0.14%)	:arrow_up:

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