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

1 files changed, 10 insertions, 1 deletions

diff --git a/source/blender/makesrna/intern/rna_main_api.c b/source/blender/makesrna/intern/rna_main_api.c
index d85c5c5f249..cc11263ad5a 100644
--- a/source/blender/makesrna/intern/rna_main_api.c
+++ b/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);