Reinstate removal of semicolon content

Commit 5b1165 was an attempt to leave semicolon content in the URL path
while ignoring it for request mapping purposes. However, it becomes
quite difficult to manage and semicolon content should not always be
ignored (sometimes a semicolon is used as a separator of multiple items
in a path segment, rather than for matrix variables).

This change effectively reverts back to the original approach in 3.2
where a flag on AbstractHandlerMapping can be used to have semicolon
content removed or kept. If kept, path segments with matrix variables
must be represented with a path segment.

The main difference is that by default it is removed everywhere
including the MVC namespace and Java config.

Issue: SPR-10427, SPR-10234

src/reference/docbook/mvc.xml

@@ -1173,9 +1173,7 @@ public void findPet(
         <para>Note that to enable the use of matrix variables, you must set the
         <classname>removeSemicolonContent</classname> property of
         <classname>RequestMappingHandlerMapping</classname> to <code>false</code>.
-        By default it is set to <code>true</code> with the exception of the
-        MVC namespace and the MVC Java config both of which automatically enable
-        the use of matrix variables.</para>
+        By default it is set to <code>false</code>.</para>
 
       </section>