Slight rework of how tajaran watches work and new papercode for taj time (#21582)

This does a few times, after the scope got bigger than I originally
planned:
- Watches now have an action button top left to check time.
- Taj time checking code was moved over to the time helper file to not
be watch exclusive.
- The taj wrist watches now shows the time on adhomai.
- Papercode now has the ability to show taj time and date, and to insert
the credit symbol.

code/modules/paperwork/pen.dm

@@ -32,6 +32,9 @@
 		\[field\] : Inserts an invisible field which lets you start type from there. Useful for forms.
 		\[date\] : Inserts today's date.
 		\[time\] : Inserts the current station time.
+		\[cr\] : Inserts the credit symbol.
+		\[tajdate\] : Inserts the current date on Adhomai.
+		\[tajtime\] : Inserts the current time on Adhomai.
 		<br>
 		Pen Exclusive Commands
 		\[small\] - \[/small\] : Decreases the size of the text.