[WIP] fix dbc attributes with spaces and special characters (issue #330)

[ebroecker]

No description provided.

[codecov-io]

Codecov Report

Merging #332 into development will increase coverage by 0.46%.
The diff coverage is 95.83%.

@@               Coverage Diff               @@
##           development     #332      +/-   ##
===============================================
+ Coverage        39.45%   39.91%   +0.46%     
===============================================
  Files               35       35              
  Lines             6945     6982      +37     
  Branches          1662     1661       -1     
===============================================
+ Hits              2740     2787      +47     
+ Misses            3995     3989       -6     
+ Partials           210      206       -4

Impacted Files	Coverage Δ
src/canmatrix/tests/test_copy.py	100% <100%> (ø)	⬆️
src/canmatrix/tests/test_dbc.py	100% <100%> (ø)	⬆️
src/canmatrix/formats/dbc.py	51.93% <83.33%> (+1.16%)	⬆️
src/canmatrix/canmatrix.py	78.5% <0%> (+0.34%)	⬆️

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