Include XML file title in warning

If a warning is thrown (i.e. if an XML file has no associated schema or isn't valid) only the file's URI is stated in the logging panel.

Example:

warning: The XML file with the URI 12345.xml cannot be stored. Is the file valid and the associated schema available?

A title would be helpful to find the respective file in TextGrid's navigator.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information