fix(memory): clear & dispose of grid to avoid mem leaks & detached elm

[ghiscoding]

• note that Flatpickr still has some mem/event leaks but a fix was put in place, we are just waiting for a new version release from their side to fix that leak
• also fixed some leaks in my own custom rendered SPA, technically that shouldn't be a problem in a regular SPA framework

[codecov]

Codecov Report

Merging #606 (6abed20) into master (5863115) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #606   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          230       230           
  Lines        16068     16126   +58     
  Branches      5179      5195   +16     
=========================================
+ Hits         16068     16126   +58     

Impacted Files	Coverage Δ
packages/common/src/extensions/menuBaseClass.ts	100.00% <100.00%> (ø)
...es/common/src/extensions/slickDraggableGrouping.ts	100.00% <100.00%> (ø)
packages/common/src/filters/compoundDateFilter.ts	100.00% <100.00%> (ø)
packages/common/src/filters/dateRangeFilter.ts	100.00% <100.00%> (ø)
...ckages/common/src/services/bindingEvent.service.ts	100.00% <100.00%> (ø)
packages/common/src/services/extension.service.ts	100.00% <100.00%> (ø)
packages/common/src/services/filter.service.ts	100.00% <100.00%> (ø)
...te-editor-component/src/compositeEditor.factory.ts	100.00% <100.00%> (ø)
...-component/src/slick-composite-editor.component.ts	100.00% <100.00%> (ø)
...tom-footer-component/src/slick-footer.component.ts	100.00% <100.00%> (ø)
... and 4 more

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