add min and max to jsonAll export #275

[ebroecker]

fixes

• min and max for json import/export
• add tests for this
• remove import * from canmatrix

[codecov-io]

Codecov Report

Merging #276 into development will decrease coverage by 0.95%.
The diff coverage is 76.66%.

@@               Coverage Diff               @@
##           development     #276      +/-   ##
===============================================
- Coverage        32.31%   31.35%   -0.96%     
===============================================
  Files               32       33       +1     
  Lines             6529     6917     +388     
  Branches          1626     1851     +225     
===============================================
+ Hits              2110     2169      +59     
- Misses            4223     4484     +261     
- Partials           196      264      +68

Impacted Files	Coverage Δ
src/canmatrix/tests/test_cmjson.py	100% <100%> (ø)	⬆️
src/canmatrix/cmjson.py	67.22% <50%> (+15.94%)	⬆️
src/canmatrix/utils.py	90.47% <0%> (-9.53%)	⬇️
src/canmatrix/tests/test_utils.py	100% <0%> (ø)
src/canmatrix/arxml.py	0.55% <0%> (ø)	⬆️
src/canmatrix/formats.py	56.04% <0%> (+6.59%)	⬆️

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