Extend layout titles not working for non-core heading fields (Hogan Banner)

[pederan]

extend_layout_titles() only works for core heading field, expecting the fireld to be named 'heading'. In Hogan Banner the heading field is named 'content_heading' thus not showing up as layout title. Should be possible to override this from a module. Possible solution: Move the function to class Module and make the value possible to override.
https://github.com/DekodeInteraktiv/hogan-core/blob/master/includes/class-core.php#L559