Update project to Angular 8

[fabiomartino]

Updated dependencies for Angular 8 (Client) and Server

(Client)

• Static dependencies versions on package.json
• Change default style to scss.
• Removed old rxjs compact dependencies.
• Rebuild structure scaffolding.

(Server)

• updated dependencies to latest versions

[LukasMarx]

Thank you very much for your PR! Keeping all the repos up to date is quite a lot of work so PRs like this are much appreciated.

Merging...