Conditional Shortcut Syntax (#7710)

* Initial Commit

* Update docs

* Add support for elseif blocks

* Another test

* WIP

* Change from `{%if%}` to `<%if%>`

See discussion here - https://talk.tiddlywiki.org/t/proposed-if-widget/7882/64

* Don't use the widget body as the template if a list-empty widget is present

See discussion here - https://github.com/Jermolene/TiddlyWiki5/pull/7710#issuecomment-1717193296

* List widget should search recursively for list-template and list-empty

* Allow block mode content within an if/then/else clause

* Update docs

* Add from-version tag to docs

editions/test/tiddlers/tests/data/conditionals/MultipleResults.tid

@@ -0,0 +1,12 @@
+title: Conditionals/MultipleResults
+description: Check that multiple results from the filter are ignored
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+This is a <% if 1 2 3 4 5 6 %>Elephant<% endif %>, I think.
++
+title: ExpectedResult
+
+<p>This is a Elephant, I think.</p>