Based on discussions from T95355 and T94193, the plan is to use
the name "Curves" to describe the data-block container for multiple
curves. Eventually this will replace the existing "Curve" data-block.
However, it will be a while before the curve data-block can be replaced
so in order to distinguish the two curve types in the UI, "Hair Curves"
will be used, but eventually changed back to "Curves".
This patch renames "hair-related" files, functions, types, and variable
names to this convention. A deep rename is preferred to keep code
consistent and to avoid any "hair" terminology from leaking, since the
new data-block is meant for all curve types, not just hair use cases.
The downside of this naming is that the difference between "Curve"
and "Curves" has become important. That was considered during
design discussons and deemed acceptable, especially given the
non-permanent nature of the somewhat common conflict.
Some points of interest:
- All DNA compatibility is lost, just like rBf59767ff9729.
- I renamed `ID_HA` to `ID_CV` so there is no complete mismatch.
- `hair_curves` is used where necessary to distinguish from the
existing "curves" plural.
- I didn't rename any of the cycles/rendering code function names,
since that is also used by the old hair particle system.
Differential Revision: https://developer.blender.org/D14007
The strings in the `get_description` functions for operators need
translation, they are not found by the translation system automatically,
and there is no translation applied afterwards either (as far as I could
tell). Some used `N_` before, but most did nothing.
Differential Revision: https://developer.blender.org/D14011
MSVC2017 and early 2019 versions are under
the impression struct OGLRender is non trivial
type due to the ThreadCondition field, not
entirely sure why, but it is what it is.
Differential Revision: https://developer.blender.org/D13742
Reviewed by: JacquesLucke
