Adding more character options to plugins and templates

[matdave]

What does it do?

Expands the qualifying character patterns for Templates and Plugins names to prevent breaking sites during upgrade.

Why is it needed?

PR #15146 reduced the available characters in these non-callable element names. This breaks older sites that used common character patterns in their names.

How to test

Attempt to add additional strings to a plugin or template names. It still blocks callable code, but allows commonly used special characters.

Related issue(s)/PR(s)

issue #15323

Edited: clarified these are referring to the names of the elements

[opengeek]

Changes to the map files must be made in the schema and generated to the map files. These changes will otherwise be overwritten the next time the schema is parsed.

[matdave]

D'oh... done