Fix lightprobe creation from python data API

### Description of the problem

Until now, it is only possible to correctly add a lightprobe in python via an operator:
`bpy.ops.object.lightprobe_add()`

### Description of the proposed solution

The idea of this patch is to fix the lack of consistency lightprobe creation without operator.
It allow creation of different lightprobe type directly via `bpy.data.lightprobes.new(name, type)` (such as for curves).

In order to make it possible I had to:
1. Add a function `BKE_lightprobe_configure` in charge of lightprobe settings configuration (avoid code redundancy)
2. Allow an object to take lightprobe datablock as data during is initialization.

### A short example of this patch usage

```
lp = bpy.data.lightprobes.new('some_name','PLANAR')

bpy.data.objects.new('toto', lp)

```

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D6396

source/blender/blenkernel/BKE_lightprobe.h

@@ -29,6 +29,7 @@ struct LightProbe;
 struct Main;
 
 void BKE_lightprobe_init(struct LightProbe *probe);
+void BKE_lightprobe_configure(struct LightProbe *probe, const short lightprobe_type);
 void *BKE_lightprobe_add(struct Main *bmain, const char *name);
 void BKE_lightprobe_copy_data(struct Main *bmain,
                               struct LightProbe *probe_dst,

source/blender/blenkernel/intern/lightprobe.c

@@ -41,6 +41,30 @@ void BKE_lightprobe_init(LightProbe *probe)
   MEMCPY_STRUCT_AFTER(probe, DNA_struct_default_get(LightProbe), id);
 }
 
+void BKE_lightprobe_configure(LightProbe *probe, const short lightprobe_type)
+{
+  probe->type = lightprobe_type;
+
+  switch (probe->type) {
+    case LIGHTPROBE_TYPE_GRID:
+      probe->distinf = 0.3f;
+      probe->falloff = 1.0f;
+      probe->clipsta = 0.01f;
+      break;
+    case LIGHTPROBE_TYPE_PLANAR:
+      probe->distinf = 0.1f;
+      probe->falloff = 0.5f;
+      probe->clipsta = 0.001f;
+      break;
+    case LIGHTPROBE_TYPE_CUBE:
+      probe->attenuation_type = LIGHTPROBE_SHAPE_ELIPSOID;
+      break;
+    default:
+      BLI_assert(!"LightProbe type not configured.");
+      break;
+  }
+}
+
 void *BKE_lightprobe_add(Main *bmain, const char *name)
 {
   LightProbe *probe;

source/blender/blenkernel/intern/object.c

@@ -804,6 +804,8 @@ static const char *get_obdata_defname(int type)
       return DATA_("Empty");
     case OB_GPENCIL:
       return DATA_("GPencil");
+    case OB_LIGHTPROBE:
+      return DATA_("LightProbe");
     default:
       CLOG_ERROR(&LOG, "Internal error, bad type: %d", type);
       return DATA_("Empty");

source/blender/editors/object/object_add.c

@@ -603,27 +603,8 @@ static int lightprobe_add_exec(bContext *C, wmOperator *op)
   copy_v3_fl(ob->scale, radius);
 
   probe = (LightProbe *)ob->data;
-  probe->type = type;
 
-  switch (type) {
-    case LIGHTPROBE_TYPE_GRID:
-      probe->distinf = 0.3f;
-      probe->falloff = 1.0f;
-      probe->clipsta = 0.01f;
-      break;
-    case LIGHTPROBE_TYPE_PLANAR:
-      probe->distinf = 0.1f;
-      probe->falloff = 0.5f;
-      probe->clipsta = 0.001f;
-      ob->empty_drawsize = 0.5f;
-      break;
-    case LIGHTPROBE_TYPE_CUBE:
-      probe->attenuation_type = LIGHTPROBE_SHAPE_ELIPSOID;
-      break;
-    default:
-      BLI_assert(!"LightProbe type not configured.");
-      break;
-  }
+  BKE_lightprobe_configure(probe, type);
 
   DEG_relations_tag_update(CTX_data_main(C));
 

source/blender/makesrna/RNA_enum_types.h

@@ -141,6 +141,8 @@ extern const EnumPropertyItem rna_enum_texture_type_items[];
 
 extern const EnumPropertyItem rna_enum_light_type_items[];
 
+extern const EnumPropertyItem rna_enum_lightprobes_type_items[];
+
 extern const EnumPropertyItem rna_enum_unpack_method_items[];
 
 extern const EnumPropertyItem rna_enum_object_type_items[];

source/blender/makesrna/intern/rna_main_api.c

@@ -250,6 +250,9 @@ static Object *rna_Main_objects_new(Main *bmain, ReportList *reports, const char
       case ID_AR:
         type = OB_ARMATURE;
         break;
+      case ID_LP:
+        type = OB_LIGHTPROBE;
+        break;
       default: {
         const char *idname;
         if (RNA_enum_id_from_value(rna_enum_id_type_items, GS(data->name), &idname) == 0) {
@@ -665,12 +668,15 @@ static FreestyleLineStyle *rna_Main_linestyles_new(Main *bmain, const char *name
   return linestyle;
 }
 
-static LightProbe *rna_Main_lightprobe_new(Main *bmain, const char *name)
+static LightProbe *rna_Main_lightprobe_new(Main *bmain, const char *name, int type)
 {
   char safe_name[MAX_ID_NAME - 2];
   rna_idname_validate(name, safe_name);
 
   LightProbe *probe = BKE_lightprobe_add(bmain, safe_name);
+
+  BKE_lightprobe_configure(probe, type);
+
   id_us_min(&probe->id);
   return probe;
 }
@@ -2079,6 +2085,9 @@ void RNA_def_main_lightprobes(BlenderRNA *brna, PropertyRNA *cprop)
   RNA_def_function_ui_description(func, "Add a new probe to the main database");
   parm = RNA_def_string(func, "name", "Probe", 0, "", "New name for the data-block");
   RNA_def_parameter_flags(parm, 0, PARM_REQUIRED);
+  parm = RNA_def_enum(
+      func, "type", rna_enum_lightprobes_type_items, 0, "Type", "The type of lightprobe to add");
+  RNA_def_parameter_flags(parm, 0, PARM_REQUIRED);
   /* return type */
   parm = RNA_def_pointer(func, "lightprobe", "LightProbe", "", "New light probe data-block");
   RNA_def_function_return(func, parm);

source/blender/makesrna/intern/rna_object.c

@@ -25,6 +25,7 @@
 #include "DNA_brush_types.h"
 #include "DNA_collection_types.h"
 #include "DNA_customdata_types.h"
+#include "DNA_lightprobe_types.h"
 #include "DNA_material_types.h"
 #include "DNA_mesh_types.h"
 #include "DNA_object_force_types.h"
@@ -196,6 +197,13 @@ const EnumPropertyItem rna_enum_metaelem_type_items[] = {
     {0, NULL, 0, NULL, NULL},
 };
 
+const EnumPropertyItem rna_enum_lightprobes_type_items[] = {
+    {LIGHTPROBE_TYPE_CUBE, "CUBE", ICON_LIGHTPROBE_CUBEMAP, "Cube", ""},
+    {LIGHTPROBE_TYPE_PLANAR, "PLANAR", ICON_LIGHTPROBE_PLANAR, "Planar", ""},
+    {LIGHTPROBE_TYPE_GRID, "GRID", ICON_LIGHTPROBE_GRID, "Grid", ""},
+    {0, NULL, 0, NULL, NULL},
+};
+
 /* used for 2 enums */
 #define OBTYPE_CU_CURVE \
   { \