fix(editors): all Editors should call commitChanges even when invalid, fixes #571

[ghiscoding]

• for the Editor validators to work properly it needs to call the commitChanges() at all time even when potentially invalid or value is unchanged so that the validator can be executed at all time
• fixes #571

[codecov]

Codecov Report

Merging #574 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #574   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          148       148           
  Lines         9816      9818    +2     
  Branches      3467      3468    +1     
=========================================
+ Hits          9816      9818    +2     

Impacted Files	Coverage Δ
...odules/angular-slickgrid/editors/longTextEditor.ts	100.00% <ø> (ø)
...es/angular-slickgrid/editors/autoCompleteEditor.ts	100.00% <100.00%> (ø)
...odules/angular-slickgrid/editors/checkboxEditor.ts	100.00% <100.00%> (ø)
...pp/modules/angular-slickgrid/editors/dateEditor.ts	100.00% <100.00%> (ø)
...p/modules/angular-slickgrid/editors/floatEditor.ts	100.00% <100.00%> (ø)
...modules/angular-slickgrid/editors/integerEditor.ts	100.00% <100.00%> (ø)
.../modules/angular-slickgrid/editors/selectEditor.ts	100.00% <100.00%> (ø)
.../modules/angular-slickgrid/editors/sliderEditor.ts	100.00% <100.00%> (ø)
...pp/modules/angular-slickgrid/editors/textEditor.ts	100.00% <100.00%> (ø)

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