Add sidebar notification "!" when Future Society can be updated

A handy little reminder that never made it into vanilla before the hiatus.

Getting my toes wet in pregmod dev.

src/uncategorized/storyCaption.tw

@@ -512,7 +512,7 @@
 		<br><span id="PAOButton"><<link [[Personal Assistant|Personal assistant options]]>><</link>></span> @@.cyan;[T]@@
 		<br><span id="policyButton"><<link [[Policies]]>><</link>></span> @@.cyan;[Y]@@
 		<<if $FSAnnounced>>
-		<br><span id="FSButton"><<link [[Future Societies|Future Society]]>><</link>></span> @@.cyan;[F]@@
+			<br><span id="FSButton"><<link [[Future Societies|Future Society]]>><</link>></span> @@.cyan;[F]@@ <<if $FSCredits > 0>>@@.yellow;[!]@@<</if>>
 		<</if>>
 		<br><span id="URButton"><<link [[Universal Rules]]>><</link>></span> @@.cyan;[V]@@
 		<br><span id="optionsButton"><<link "Game Options">><<set $nextButton = "Back", $nextLink = _Pass>><<goto "Options">><</link>></span> @@.cyan;[O]@@