More robust infinite recursion handling with custom exception (#7882)

* Introduced preliminary idea for infinite recurse exception

* Better handling of infinite recursion

But it could be better still...

* the TransclusionError is a proper error

Moved the magic number to be on the error's class. Not sure if that's
a great idea.

* Fixed minor minor issue that came up in conflict

The minor fix to the jasmine regexp that escaped a '+' somehow
broke some random test.

editions/test/tiddlers/tests/data/transclude/Recursion.tid

@@ -7,7 +7,8 @@ title: Output
 
 \whitespace trim
 <$transclude $tiddler="Output"/>
+
 +
 title: ExpectedResult
 
-<p><span class="tc-error">Recursive transclusion error in transclude widget</span></p>
+<span class="tc-error">Recursive transclusion error in transclude widget</span>