feat(*): Upgrade to Angular 6, fix breaking changes

[itsdevdom]

• Upgrade to Angular 6 and RxJS 6, plus update other dependencies
• Fix breaking changes (mostly RxJS imports)
• Remove unused imports
• Update and simplify webpack config (upgrade to Webpack 4, remove dll stuff and other plugins)
• Update jest config (verbose, ignore dist folder)
• Replace custom typings file with web-animations-js typings

Closes #82.
BREAKING CHANGE: The upgrade to Angular 6 breaks compatibility with Angular 5.

[itsdevdom]

Will superseed #80.

[codecov]

Codecov Report

Merging #83 into develop will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           develop      #83   +/-   ##
========================================
  Coverage    99.13%   99.13%           
========================================
  Files           14       14           
  Lines          460      460           
  Branches        79       79           
========================================
  Hits           456      456           
  Misses           4        4

Impacted Files	Coverage Δ
...lib/src/components/notifier-container.component.ts	97.64% <ø> (ø)	⬆️
src/lib/src/services/notifier-queue.service.ts	100% <100%> (ø)	⬆️
src/lib/src/services/notifier.service.ts	100% <100%> (ø)	⬆️
...lib/src/animation-presets/fade.animation-preset.ts	100% <100%> (ø)	⬆️
jest.setup.ts	100% <100%> (ø)	⬆️

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