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
8a855f9cbd