License UI redesign + composition API (#3225)

* refactor(frontend): revamp license page

- Add more understandable UI
  - Field titles
  - Field description
- Use more semantically correct elements
  - Make paragraph not a label
- Rephrase some parts
- Fields no longer jump around
- Split SPDX-identifier and license name into two seperate fields, for readability
- Sort imports
- fmt

* feat(frontend): encourage license URL on custom license

* refactor(frontend): license page to composition + ts

- Move to Vue composition API
- Move to TypeScript
- Move away from vue-multiselect to the dropdown component
- Use `formatProjectType` function for typesafety
- Remove unused form error highlighting code
- Creating typings for built-in licenses
- Move standard licenses to licenses.ts util
  - There are other license-related utils I want to move there eventually
- Fix typo in Project license type definition

* chore(frontend): fmt

* chore(frontend): fmt

* feat(frontend): require URL and name for custom license

* refactor(frontend): give license or-later checkbox own row

* chore(frontend): fmt

Author: Erb3