feat: improve qa station

[Herman1412]

improved intuitiveness in qa station along with some model additions and chages

close: #425

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) feature

• What is the current behavior? (You can also link to an open issue here) no worker NPCs and overall bad intuitiveness. See #425

• What is the new behavior? (if this is a feature change) Added NPCs to empty stations along with text over doors and improved NPC dialogue. Minor changes to the scene and button colors.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) no

• Other information: none

[MarkusJohansen]

Very nice changes. Should add more signs to doors in other scenes as well, especially HSE room. Red text color should be switched for a higher contrast color depending on the background. White sign/background and black text might be best. Perhaps a different model for factoryworkers, seems a bit odd to handle fish and look like a medical worker. Else good to merge

I suggest that we merge now, to improve some user experience before the user test, and fix this in a later issue!