Style filter arguments can now be quoted.

For backward compatibility you don't have to quote arguments that contain
spaces or symbols but its a good idea to do so from now on. The documentation
has been updated to follow this guideline.

You can now use a pipe symbol in a regular expression which there
was no way of doing before.

Eg:  ${name|subst:"(Dr|Doctor|Dokter) ~>Doktor "}

git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@3289 25d90789-57f7-4ee0-8453-03a3dfeeeb22