fix(editor): dynamically adding editor column throws error, fixes #195

[ghiscoding]

• Column with Editors are special because we need to swap them internally in the library to a property named "internalColumnEditor", we do this because SlickGrid has "editor" reserved to a factory but that is completely different than the implementation in Angular-Slickgrid, so if user add a column dynamically, it should also be analyzed as well at that time.

[codecov-io]

Codecov Report

Merging #212 into master will decrease coverage by 1.69%.
The diff coverage is 42.86%.

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
- Coverage   43.25%   41.56%   -1.68%     
==========================================
  Files         146      146              
  Lines        6857     6841      -16     
  Branches     2169     2263      +94     
==========================================
- Hits         2965     2843     -122     
- Misses       3891     3995     +104     
- Partials        1        3       +2

Impacted Files	Coverage Δ
...lickgrid/components/angular-slickgrid.component.ts	60.46% <42.86%> (+0.06%)	⬆️
...-slickgrid/extensions/checkboxSelectorExtension.ts	28.58% <0%> (-71.42%)	⬇️
...ular-slickgrid/extensions/headerButtonExtension.ts	40% <0%> (-60%)	⬇️
...kgrid/extensions/groupItemMetaProviderExtension.ts	50% <0%> (-50%)	⬇️
...gular-slickgrid/extensions/autoTooltipExtension.ts	52.95% <0%> (-47.05%)	⬇️
...rid/extensions/cellExternalCopyManagerExtension.ts	16.48% <0%> (-37.55%)	⬇️
...dules/angular-slickgrid/services/shared.service.ts	78.58% <0%> (-21.42%)	⬇️
...s/angular-slickgrid/extensions/extensionUtility.ts	61.91% <0%> (-14.28%)	⬇️
...ular-slickgrid/extensions/rowSelectionExtension.ts	94.12% <0%> (-5.88%)	⬇️
...dules/angular-slickgrid/services/filter.service.ts	17.38% <0%> (ø)	⬆️
... and 1 more

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