Matt Holt 2f7ceb5774 templates: Offically make templates extensible (#5939)
* templates: Offically make templates extensible

This supercedes #4757 (and #4568) by making template extensions
configurable.

The previous implementation was never documented AFAIK and had only
1 consumer, which I'll notify as a courtesy.

* templates: Add 'maybe' function for optional components

* Try to fix lint error
2023-12-07 13:26:21 -07:00
..
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