RxJS6 code migration

[prikryl]

removed rxjs-compat dependency. Fixed imports to rxjs/operators. Migrated code to RxJS6 style.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@8aee01c). Click here to learn what that means. The diff coverage is 81.41%.

@@           Coverage Diff            @@
##             master    #971   +/-   ##
========================================
  Coverage          ?   82.6%           
========================================
  Files             ?      13           
  Lines             ?     575           
  Branches          ?     137           
========================================
  Hits              ?     475           
  Misses            ?      21           
  Partials          ?      79

Impacted Files	Coverage Δ
src/test.ts	100% <100%> (ø)
src/app/demo/sample-section.component.ts	45.45% <14.28%> (ø)
src/app/lib/ngx-select/ngx-templates.directive.ts	68.42% <45.45%> (ø)
src/app/lib/ngx-select/ngx-select.module.ts	54.54% <50%> (ø)
src/app/demo/select/children-demo.ts	63.63% <55.55%> (ø)
src/app/demo/select/rich-demo.ts	58.82% <56.25%> (ø)
src/app/app.component.ts	62.5% <60%> (ø)
src/app/demo/select/no-autocomplete-demo.ts	71.42% <62.5%> (ø)
src/app/demo/select/multiple-demo.ts	66.66% <63.63%> (ø)
src/app/demo/select-section.ts	69.23% <69.23%> (ø)
... and 3 more

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[optimistex]

Merged into the fork: https://github.com/optimistex/ngx-select-ex

[gagandeepp]

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