fix(build): enable tsconfig strict mode tsconfig, fixes #675

[ghiscoding]

No description provided.

[codecov]

Codecov Report

Merging #702 (718fbcb) into master (61e6599) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #702   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          159       159           
  Lines        10595     10611   +16     
  Branches      3728      3754   +26     
=========================================
+ Hits         10595     10611   +16     

Impacted Files	Coverage Δ
...odules/angular-slickgrid/editors/longTextEditor.ts	100.00% <ø> (ø)
...ular-slickgrid/extensions/columnPickerExtension.ts	100.00% <ø> (ø)
...slickgrid/extensions/draggableGroupingExtension.ts	100.00% <ø> (ø)
...ular-slickgrid/extensions/headerButtonExtension.ts	100.00% <ø> (ø)
.../angular-slickgrid/services/graphqlQueryBuilder.ts	100.00% <ø> (ø)
...es/angular-slickgrid/services/gridEvent.service.ts	100.00% <ø> (ø)
...dules/angular-slickgrid/sorters/sorterUtilities.ts	100.00% <ø> (ø)
...les/angular-slickgrid/aggregators/avgAggregator.ts	100.00% <100.00%> (ø)
...les/angular-slickgrid/aggregators/maxAggregator.ts	100.00% <100.00%> (ø)
...les/angular-slickgrid/aggregators/minAggregator.ts	100.00% <100.00%> (ø)
... and 71 more

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