Assorted organization of job-related files + fixed senior courier ID missing a job icon

[Hitlinemoss]

About the PR

Reorganizes several job-related files (see technical details). This is all backend code cleanup for the most part, though I also took the time to fix the fact that there wasn't an actual prototype for the senior courier ID card like for other senior jobs' ID cards.

Why / Balance

Organized code good. This makes it much easier to find any specific job in these files, since instead of needing to scroll through massive unsorted lists you just go to the appropriate section.

For future reference, here's the typical ordering I use to sort files like this:

• Command
  • Department heads go here despite also being members of their subordinate departments
  • For station beacons specifically I put AI in its own section after this since it's a highly specific Command-restricted area
• Cargo
• Engineering
• Medical
• Science
• Security
• Service
• Silicon
• Visitors
• CentComm / ERT
  • These are grouped together since the ERT is technically a part of CentComm.
• Antagonists
• Other
  • This can sometimes be broken off into its own groups if necessary (e.g figurines having an "Animals" category).

Technical details

• Files related to figurines (locale, datasets, prototypes) are all now sorted by department
• Job description locale file is now sorted by department
• Files related to station beacons (locale, prototypes) are all now sorted by department
• PDA prototype file is now sorted by department
• ID card prototype file is now sorted by department
• Added SeniorCourierIDCard entity prototype
• Added SeniorCourier.png to job_icons.rsi

Media

Requirements

• I have read and am following the Pull Request and Changelog Guidelines.
• I have added media to this PR or it does not require an in-game showcase.

Breaking changes

N/A

Changelog

🆑

• fix: Senior courier ID cards now have a unique job icon, as with other senior jobs.

[github-actions]

RSI Diff Bot; head commit 6438520 merging into 92482df
This PR makes changes to 1 or more RSIs. Here is a summary of all changes:

Resources/Textures/Interface/Misc/job_icons.rsi

State	Old	New	Status
SeniorCourier			Added

Edit: diff updated after 6438520