update to latest angular and cli

[DenysVuika]

PR Checklist

Please check if your PR fulfills the following requirements:

- [ ] The commit message follows our guidelines: https://github.com/Alfresco/alfresco-content-app/blob/master/CONTRIBUTING.md#commit
- [ ] Tests for the changes have been added (for bug fixes / features)
- [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application / Infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Upgrade to latest Typescript and Angular with important upstream changes regarding production builds (see details here: https://github.com/angular/angular-cli/releases/tag/v7.0.4)

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov-io]

Codecov Report

Merging #774 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development     #774   +/-   ##
============================================
  Coverage        52.49%   52.49%           
============================================
  Files              106      106           
  Lines             2903     2903           
  Branches           575      575           
============================================
  Hits              1524     1524           
  Misses            1300     1300           
  Partials            79       79

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