feat(editors): add min/max length options to text editors

[ghiscoding]

• add a text length counter (currentTextLength/maxLength) to the LongText Editor
• the new minLenght, maxLength options can be used by the following Editors (autoComplete, longText, text)
• also flip the position of the Cancel/Save buttons, Cancel should be on the left and Save on the right

[codecov]

Codecov Report

Merging #542 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #542    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          148       148            
  Lines         9663      9708    +45     
  Branches      3258      3410   +152     
==========================================
+ Hits          9663      9708    +45     

Impacted Files	Coverage Δ
...lar-slickgrid/editorValidators/integerValidator.ts	100.00% <ø> (ø)
...es/angular-slickgrid/editors/autoCompleteEditor.ts	100.00% <ø> (ø)
...pp/modules/angular-slickgrid/editors/textEditor.ts	100.00% <ø> (ø)
src/app/modules/angular-slickgrid/constants.ts	100.00% <100.00%> (ø)
...ngular-slickgrid/editorValidators/textValidator.ts	100.00% <100.00%> (ø)
...odules/angular-slickgrid/editors/longTextEditor.ts	100.00% <100.00%> (ø)

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