Yafray export code moved to source/blender/yafray to keep blender/src pure C

code. Now all the cpp code is in intern under yafray and the api include
file is just plain C

Also changed old include in initrender.c and updated Makefiles.am and configure.ac
so the new dirs are taken into account.

source/blender/render/intern/source/initrender.c

@@ -102,7 +102,7 @@
 #include "initrender.h"
 
 /* yafray: include for yafray export/render */
-#include "yafray_Render.h"
+#include "YafRay_Api.h"
 
 /* Some crud :/ */
 #define ELEM3(a, b, c, d)       ( ELEM(a, b, c) || (a)==(d) )