Harald Eilertsen 308380fe52 Add 'extends' attribute to theme info ...

To create a derived (or child) theme, the array held in
`App::$theme_info` must contain a key `extends` that contains the name
of the parent theme as a value.

The derived theme tutorial would suggest adding the key in the
`themename_init()` function, however this does not work. The theme info
is repopulated from the theme info file after the theme init function
has run, and so the `extends` key disappears.

This patch adds `extends` as a first class attribute for themes, so that
it can be specified directly in the theme info in the top file comment
block. It also updates the derived theme tutorial to reflect this
change.

2025-07-20 20:23:25 +02:00

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