Implement "Change username" feature
bailey(dilatory): mobile update, dilatory changes
fix(bailey): add links to recent update
feat(admin): allow admins to update user's items (restoring lost items,
granting quest scrolls, etc). @deilann :)
feat(dilatory): add dilatory achievement
remove beta from api call examples

The API documentation examples used beta.habitrpg.com as url. Additionally, the base URL was specified including "/user/". removed both to avoid confusion and make copy-paste easier
Merge pull request #3754 from vIiRuS/patch-3

remove beta from api call examples
Merge pull request #3597 from 3onyc/feature/username-change

Implement "Change username" feature