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, 1 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_lightprobe.h b/source/blender/blenkernel/BKE_lightprobe.h
index bd442c97000..3d59929ada7 100644
--- a/source/blender/blenkernel/BKE_lightprobe.h
+++ b/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,