feat(resizer): change onGridBeforeResize to return event, issue #215

[ghiscoding]

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[codecov-io]

Codecov Report

Merging #216 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
+ Coverage   45.51%   45.54%   +0.04%     
==========================================
  Files         146      146              
  Lines        6898     6902       +4     
  Branches     2176     2260      +84     
==========================================
+ Hits         3139     3143       +4     
+ Misses       3758     3757       -1     
- Partials        1        2       +1

Impacted Files	Coverage Δ
...ules/angular-slickgrid/services/resizer.service.ts	95.54% <100%> (+0.17%)	⬆️
...dules/angular-slickgrid/services/filter.service.ts	17.38% <0%> (ø)	⬆️

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