refactor : turning newscasters into "props" (#5522)

# About the pull request

fallowing what TGMC did there

https://github.com/tgstation/TerraGov-Marine-Corps/blob/master/code/game/objects/machinery/newscaster.dm

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# Explain why it's good for the game
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
refactor: turning newscasters into "props".
/:cl:

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Co-authored-by: Julien <[email protected]>