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/mob/living/carbon/human/human.dm

@@ -228,6 +228,9 @@
 		. += "Energy: [round(DS.stored_energy)] / [round(DS.max_energy)]"
 		if(DS.regen_limb)
 			. += "Regeneration Progress: [round(DS.regen_limb_progress)] / [LIMB_REGROW_REQUIREMENT]"
+	var/custom_time = culture.get_custom_time()
+	if(custom_time)
+		. += custom_time
 	if(internal)
 		if(!internal.air_contents)
 			qdel(internal)