(API Change) libobs: Remove source_type param from functions

(Note: test and UI are also modified by this commit)

API Changed (removed "enum obs_source_type type" parameter):
-------------------------
obs_source_get_display_name
obs_source_create
obs_get_source_output_flags
obs_get_source_defaults
obs_get_source_properties

Removes the "type" parameter from these functions.  The "type" parameter
really doesn't serve much of a purpose being a parameter in any of these
cases, the type is just to indicate what it's used for.

libobs/obs-scene.c

@@ -711,9 +711,8 @@ const struct obs_source_info scene_info =
 
 obs_scene_t *obs_scene_create(const char *name)
 {
-	struct obs_source *source =
-		obs_source_create(OBS_SOURCE_TYPE_INPUT, "scene", name, NULL,
-				NULL);
+	struct obs_source *source = obs_source_create("scene", name, NULL,
+			NULL);
 	return source->context.data;
 }