This allows custom themes to have an extends key that should include another theme (built in or custom) name which indicates this theme should inherit that one. Any properties not set by this theme will be inherited from the theme you extend from. This is also recursive so you can have one theme extending from a theme that extends another.
This allows custom themes to have an
extends
key that should include another theme (built in or custom) name which indicates this theme should inherit that one. Any properties not set by this theme will be inherited from the theme you extend from. This is also recursive so you can have one theme extending from a theme that extends another.Fixes #262