30e3f14bcd
This implements removing of groups and adds an operator `GREASE_PENCIL_OT_layer_group_remove`. Groups can be removed in two ways: * Remove the group and keep the children. * Remove the group together with all its children. Based on an earlier attempt by @PratikPB2123 here: !121611 Pull Request: https://projects.blender.org/blender/blender/pulls/121663