Add apply filter run prefix

The map filter run prefix is often used as a way to move a computed value in the input list into a variable so that it can be used as a parameter of a filter operator. The apply filter run prefix extends this idea to make the input list available as variables $1, $2 etc. Unlike the map prefix, the apply filter run is only evaluated once.

editions/test/tiddlers/tests/data/filters/FilterRunPrefixesApply.tid

@@ -0,0 +1,13 @@
+title: Filters/FilterRunPrefixes/Applu
+description: Applu filter run prefix
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\whitespace trim
+<$text text={{{ a b c :apply[<$1>addsuffix<$2>addsuffix<$3>] }}}/>
++
+title: ExpectedResult
+
+<p>abc</p>