API update from OpenDX and MRC

[spyke7]

This is regarding #161

Implemented from_grid() a static method and native (property) inside OpenDX.py and mrc.py

• Just simply added those two functions inside files
• register converters
• change export
• write tests

[codecov]

Codecov Report

❌ Patch coverage is 91.17647% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.59%. Comparing base (b29c1f4) to head (4243676).

Files with missing lines	Patch %	Lines
gridData/core.py	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   88.20%   88.59%   +0.38%     
==========================================
  Files           5        5              
  Lines         814      833      +19     
  Branches      107      107              
==========================================
+ Hits          718      738      +20     
- Misses         56       57       +1     
+ Partials       40       38       -2     

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[spyke7]

@orbeckst pls check this kindly

[orbeckst]

This is already looking pretty good. Please also add doc strings and update CHANGELOG. Will have a closer look once this is done. Thank you!