Enable linking to pattern candidates and issues

[mhinkie]

Is your feature request related to a problem? Please describe.
Currently it is not possible to use the address shown for a specific pattern candidate or a specific issue to directly link to this candidate or issure from the outside.
To reproduce:

• Create a new candidate or issue - upon opening the details view an address with the following format will be shown
  • http://localhost:1978/issue/detail/TESTISSUE
  • http://localhost:1978/candidate/detail/Testcandidate
• Open this Adress: The patternatlas landing page will be shown.

Describe the solution you'd like
Enable direct linking of pattern candidates and issues similar to how patterns are handled.
E.g. a pattern link http://localhost:1978/pattern-languages/af7780d5-1f97-4536-8da7-4194b093ab1d/d4f7c247-e2bb-4301-ad06-f758fa58f2dc always correctly shows the pattern.

Additional context
Depending on the authentication status sometimes also the "New Issue" and "New Candidate" view is shown upon opening the current links.

For a working implementation refer to the routing for patterns:
src/app/pattern-language-management/pattern-language-management-routing.module.ts
src/app/pattern-language-management/pattern-language-management.module.ts

[mhinkie]

When rewriting the navigation for issues and candidates examine the state-stores mentioned in #68 (comment)

[mhinkie]

Fixed in #160
State-Stores are removed and routing is fixed to load issues and candidate corretly when opened via URL