BREAKING CHANGE: migrate to Slickgrid-Universal v4.0 and Aurelia 2, fixes #709

[ghiscoding]

⚠️ requires Slickgrid-Universal v4.0 and Aurelia 2

[codecov]

Codecov Report

Attention: 68 lines in your changes are missing coverage. Please review.

Comparison is base (827f90c) 99.90% compared to head (ec02764) 22.74%.
Report is 6 commits behind head on master.

Files	Patch %	Lines
...lia-slickgrid/custom-elements/aurelia-slickgrid.ts	0.00%	68 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1124       +/-   ##
===========================================
- Coverage   99.90%   22.74%   -77.16%     
===========================================
  Files           9        8        -1     
  Lines         933      893       -40     
  Branches      338      313       -25     
===========================================
- Hits          932      203      -729     
- Misses          1      690      +689     

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