Trim whitespace when importing variables in $importvariables (#7611)

* fix: trim whitespace when importing variables

* feat: added tests for importing variables

editions/test/tiddlers/tests/data/importvariables/WithSetWidgetsAndMacros.tid

@@ -0,0 +1,29 @@
+title: ImportVariables/WithSetWidgetsAndMacros
+description: Import variables defined with a set widget without whitespace pragma
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\whitespace trim
+\import Definitions
+<$text text=<<name>>/>,
+<$text text=<<address>>/>,
+<$text text=<<one>>/>,
+<$text text=<<two>>/>
++
+title: Definitions
+
+\define name() Bugs Bunny
+\procedure address()
+Bunny Hill
+\end
+
+<$set name="one" value="elephant">
+<$set name="two" value="giraffe">
+</$set>
+</$set>
++
+title: ExpectedResult
+
+<p>Bugs Bunny,Bunny Hill,elephant,giraffe</p>