Adds a sports betting/polling app (#90421)

## About The Pull Request

Adds a new PDA app that allows you to create polls that people can bet
on with credits, the owner can then lock the bets, decide what the
answer is (up to the player for whatever poll they made), and send it
off, giving the money the losers bet into the accounts of the winners.

It's a small PDA app that currently doesn't make any announcements or
come preinstalled in anything, but that's subject to change. PDA screen
sprite is codersprited.

Video demonstration


https://github.com/user-attachments/assets/449e1f0b-7fd3-4948-bff8-2793af831360

Not shown (as I added later), it now uses newscasters as well.


![image](https://github.com/user-attachments/assets/d3defa60-03cc-4557-98b7-b4088b158b3d)

###### Code bounty of
https://forums.tgstation13.org/viewtopic.php?t=38278

## Why It's Good For The Game

Allows people to host polls for station events, allowing for the SS13
version of sports betting.

## Changelog
🆑
add: Adds a new sports betting app on your PDA, you can now host and
vote on polls using in-game credits.
/🆑

---------

Co-authored-by: san7890 <the@san7890.com>

code/controllers/subsystem/economy.dm

@@ -187,7 +187,7 @@ SUBSYSTEM_DEF(economy)
 			update_alerts = TRUE
 			inflict_moneybags(moneybags)
 	earning_report += "That's all from the <i>Nanotrasen Economist Division</i>."
-	GLOB.news_network.submit_article(earning_report, "Station Earnings Report", "Station Announcements", null, update_alert = update_alerts)
+	GLOB.news_network.submit_article(earning_report, "Station Earnings Report", NEWSCASTER_STATION_ANNOUNCEMENTS, null, update_alert = update_alerts)
 	return TRUE
 
 /**