Allow "<<color>>" as a synonym for the "<<colour>>" macro

Entente cordiale!

core/ui/PageMacros.tid

@@ -3,6 +3,9 @@ title: $:/core/ui/PageMacros
 \define colour(name)
 <$transclude tiddler={{$:/palette}} index="$name$"/>
 \end
+\define color(name)
+<<color $name$>>
+\end
 \define tabs(tabsList,default,state:"$:/state/tab")
 <div class="tw-tab-buttons"><$list filter="$tabsList$" variable="currentTab"><$button set=<<qualify "$state$">> setTo=<<currentTab>> default="$default$" selectedClass="tw-tab-selected"><$transclude tiddler=<<currentTab>> field="caption"><$macrocall $name="currentTab" $type="text/plain" $output="text/plain"/></$transclude> </$button>
 </$list>

core/ui/PageStylesheet.tid

@@ -3,6 +3,9 @@ title: $:/core/ui/PageStylesheet
 \define colour(name)
 <$transclude tiddler={{$:/palette}} index="$name$"/>
 \end
+\define color(name)
+<<colour $name$>>
+\end
 \define border-radius(radius)
 ```
   -webkit-border-radius: $radius$;