Refactor/remove unused suspense wrappers

[tobias-wiese]

Description

Implements issue #338

Reason for this PR

• We are currently using own wrapper components to render async components with suspense. This is not needed

Changes in this PR

• I replaced the wrappers including the fallback loading component by implementing the async API calls in the components to render within async functions that are called with the onBeforeMount lifecycle hook. The loading component is rendered via a refed busy boolean that indicates whether the component is loading data or not. (see description in Remove unused Wrappers #338 )

Type of change (remove all that don't apply)

• Refactoring

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Manually tested all use cases this could alter

Test Configuration:

• OS: Windows

• Browser: Firefox

• Frontend: (remove all that don't apply)

  • Development build

• Backend: (remove all that don't apply)

  • No backend needed to test this
  • Deployed master version 0.5.0

Checklist: (remove all that don't apply)

• I have performed a self-review of my own code
• My changes generate no new linting warnings or console warnings
• I have updated the CHANGELOG.md to include any changes made in this PR (add WIP to the top, if there is none already)

[bastihav]

Good work.
One note:

• Changing the v-if v-else order is a discussion point, feel free to reject those.