Possibility to reorder some user-ordered list/leaf-list entries defined in a template

[QiufangMa]

No description provided.

[jsterne]

We'll need to carefully consider how to handle user-ordered lists, especially when multiple templates can apply to a list or leaflist, and those templates may have different or conflicting information about the order of the entries.

[QiufangMa]

I agree we need to be careful, but I think it as a "nice-to-have" capability, in cases where the ordering carries some meaning.

If we allow multiple templates to be applied to a same node, then a priority should be specified with that, as conflict occurs if different templates declares different values for a same node. But I think the user-decided order should always takes the first priority (e.g., the entry marked with position-first should always be the first entry when merging).