Use Composer to manage the dependency on phpseclib.
TPCStorage: Fix two possible PHP warnings.
TPCStorage: Require to specify the back-end class in the server array.

Much better than intransparently hardcoding the class choice depending on certain keys in the array.

This also allows "dummy servers" which have to handle their mirroring independently from the extension - a welcome change in view of the rather terrible SFTP back-end.
{{thcrap TL include}}: Map the base page to its language code as well.

This is the easy part of the Japanese patch.
Remove HTML comments and translation markup.

With a lengthy justification about why we use regex for it after all.
Sanitize spell card name and owner, as well as assist character names.