Converts some notify_ghosts args to bitflags, multilines all notify_ghosts calls (#79320)

## About The Pull Request

This helps clean up my favorite helper proc in the whole codebase,
`notify_ghosts()`.

The notify_suiciders, ignore_mapload, and flashwindow args are GONE.
They have been replaced with the notify_flags bitflag argument. This was
intended to make deadchat announcements a bitflag argument too, but
those got reverted right before I originally wanted to submit this PR.

The on-screen popup now shows the notification body when you hover it
with your mouse again. The format is now `[notify_ghosts message] --
[click action (orbit/jump/play)]`

Every single `notify_ghosts()` call has been changed to multiline format
and has been given trailing commas. Pretty!
## Why It's Good For The Game

Cleans up a proc that is very popular and going through a lot of changes
at the time.

Allows for further flexibility when this proc inevitably gets tweaked or
improved. 12 -> 10 args is an improvement, and it doesn't impact the
helper's flexibility at all.
## Changelog
🆑 Rhials
code: The notify_ghosts proc has been cleaned up. Please report any
abnormal changes in deadchat notification behavior.
qol: The on-screen deadchat popups now contain the notification blurb
when hovered with your mouse again.
/🆑

code/modules/shuttle/battlecruiser_starfury.dm

@@ -172,14 +172,14 @@
 					"The battlecruiser has an object of interest: [our_candidate]!",
 					source = our_candidate,
 					action = NOTIFY_ORBIT,
-					header = "Something's Interesting!"
-					)
+					header = "Something's Interesting!",
+				)
 			else
 				notify_ghosts(
 					"The battlecruiser has an object of interest: [spawner]!",
 					source = spawner,
 					action = NOTIFY_ORBIT,
-					header="Something's Interesting!"
-					)
+					header="Something's Interesting!",
+				)
 
 	priority_announce("Unidentified armed ship detected near the station.")