fix(editors): complex objects should work with all editors

[ghiscoding]

• add Jest unit tests for all Editors
• increase code coverage for some Filters unit tests

[codecov-io]

Codecov Report

Merging #296 into master will increase coverage by 9.64%.
The diff coverage is 99.62%.

@@            Coverage Diff             @@
##           master     #296      +/-   ##
==========================================
+ Coverage   86.68%   96.32%   +9.64%     
==========================================
  Files         134      134              
  Lines        7408     7536     +128     
  Branches     2549     2564      +15     
==========================================
+ Hits         6421     7258     +837     
+ Misses        987      278     -709

Impacted Files	Coverage Δ
.../modules/angular-slickgrid/filters/sliderFilter.ts	100% <ø> (ø)	⬆️
...odules/angular-slickgrid/editors/checkboxEditor.ts	100% <100%> (+69.65%)	⬆️
...dules/angular-slickgrid/services/export.service.ts	100% <100%> (ø)	⬆️
.../modules/angular-slickgrid/editors/selectEditor.ts	98.89% <100%> (+84.6%)	⬆️
...es/angular-slickgrid/editors/autoCompleteEditor.ts	99.25% <100%> (+0.02%)	⬆️
...dules/angular-slickgrid/filters/dateRangeFilter.ts	99.2% <100%> (+0.06%)	⬆️
...pp/modules/angular-slickgrid/editors/textEditor.ts	100% <100%> (+73.62%)	⬆️
...modules/angular-slickgrid/editors/integerEditor.ts	100% <100%> (+80.22%)	⬆️
...p/modules/angular-slickgrid/editors/floatEditor.ts	100% <100%> (+82.5%)	⬆️
...es/angular-slickgrid/filters/compoundDateFilter.ts	100% <100%> (ø)	⬆️
... and 16 more

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