[ADF-3938] support for XMLHttpRequest.withCredentials flag

[DenysVuika]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

What is the current behaviour? (You can also link to an open issue here)

What is the new behaviour?

• provide support for XMLHttpRequest.withCredentials (corresponding flag has been previously contributed to JS-API by the community)
• global (app config) setting to enable both PDF Viewer and JS-API flags

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

refs Alfresco/alfresco-content-app#894

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:
https://issues.alfresco.com/jira/browse/ADF-3938

[eromano]

./demo-shell/src/app.config.json invalid
data.baseShareUrl should be string

[DenysVuika]

@eromano I removed baseShareUrl from the app.config as it makes no sense setting it to null there.

[codecov-io]

Codecov Report

Merging #4190 into development will increase coverage by 0.45%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #4190      +/-   ##
===============================================
+ Coverage        82.67%   83.12%   +0.45%     
===============================================
  Files              677      298     -379     
  Lines            19341     9863    -9478     
  Branches          2855     1439    -1416     
===============================================
- Hits             15990     8199    -7791     
+ Misses            2486     1235    -1251     
+ Partials           865      429     -436

Impacted Files	Coverage Δ
lib/core/services/people-process.service.ts
lib/core/services/jwt-helper.service.ts
lib/core/buttons-menu/buttons-menu.module.ts
...-view-selectitem/card-view-selectitem.component.ts
lib/core/info-drawer/index.ts
lib/core/datatable/data/data-row-event.model.ts
lib/core/buttons-menu/buttons-menu.component.ts
lib/core/directives/index.ts
lib/core/language-menu/index.ts
lib/core/pipes/time-ago.pipe.ts
... and 366 more

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