This renames the `BKE_gpencil_*` as well as the `DNA_gpencil_types.h`
files to indicate that it's the legacy grease pencil.
Pull Request: blender/blender#105597
This renames the `OB_GPENCIL` object type and the `ID_GD` to `OB_GPENCIL_LEGACY` and `ID_GD_LEGACY` respectively.
There is no change for the user.
Pull Request: blender/blender#105541
We (Dalai, Hans, Falk, Simon and me) decided that the curves edit mode
is useful enough to justify moving it out of experimental now. So far it
supports the following features:
* Various selection tools. The selections are synced with sculpt mode.
* Transform tools.
* Delete curves/points.
More functionality of the old curve edit mode will be ported over in
future releases.
