There is no (good) reason to use 'refine' internal code to create RNA
pointers of IDs, these always ignore any 'ID inheritance', since by
definition the 'owner ID' info of an ID PointerRNA is always that ID.
Similarily, do not call RNA pointers creation code with null data, this
will simply return `PointerRNA_NULL`, can as well return that directly.
Pull Request: https://projects.blender.org/blender/blender/pulls/133668
This PR refactors each UI template into its own `interface_template_*.cc`
file.
* Added `interface_templates_intern.hh` which exposes shared utility
functions and macros.
* Doxygen comment sections that were redundant of the file name were
removed. If they contained additional description, they were added
to the file Doxygen `\file` header.
* Short templates that were closely related were kept together in single
files (e.g `uiTemplateHistogram`, `uiTemplateWaveform` and
`uiTemplateVectorScope` are all in `interface_template_scopes.cc`).
In this case, Doxygen comment section were preserved.
The only things remaining in `interface_templates.cc` are:
* Common utility function exposed by `interface_templates_intern.hh`
* Small independent templates (`uiTemplatePathBuilder`,
`uiTemplateNodeSocket` and `uiTemplateFileSelectPath`)
Ref: https://projects.blender.org/blender/blender/issues/117604
Pull Request: https://projects.blender.org/blender/blender/pulls/132468
