User management

[jschreuder]

• [x] View existing users (with linked departments)
• [x] Edit existing users
• [x] User creation
• [x] Assigning and removing users from departments
• [x] User removal
• [x] User activation and deactiviation

[jschreuder]

Create user implemented in 95b456363ca3fb6a7d79788982c4ca3aedd98eb0

[jschreuder]

Viewing users and UI for assigning/removing from departments added in 3b5a6256e3a91a295c6d4754673fbcbe8a6dbb49

[jschreuder]

Implemented assigning and removing users from departments in b051ce98d514dd4762e4acc12d3a9d2e95efc743

[jschreuder]

Implemented user removal in f264f0290a7d1015932ffaed3df29fd8541d5350

[jschreuder]

Made it possible to edit users in 44fb117d5c7c9795c4f7fa89718ed67f25edfcd4

[jschreuder]

Added active/inactive to users in 137db9d63fecc1c8dd27a07b59057d621cdfde1b