fix(core): mem leaks w/orphan DOM elements when disposing, fixes #625

[ghiscoding]

• fixes issue Angular-Slickgrid Leaks Detached DOM Elements & Cause Slowness with Input KeyStroke Typing #625

[codecov]

Codecov Report

Merging #626 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #626   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          149       149           
  Lines         9987     10048   +61     
  Branches      3530      3538    +8     
=========================================
+ Hits          9987     10048   +61     

Impacted Files	Coverage Δ
...lickgrid/components/angular-slickgrid.component.ts	100.00% <100.00%> (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)
...odules/angular-slickgrid/editors/longTextEditor.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)
... and 25 more

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