Texture Browser updated for Blender 2.8 drawing

The drawing code has been abstracted into a `draw.py` for Blender 2.8
and `draw_27.py` for earlier versions.

blender_cloud/texture_browser/nodes.py

@@ -0,0 +1,26 @@
+import pillarsdk
+
+
+class SpecialFolderNode(pillarsdk.Node):
+    NODE_TYPE = 'SPECIAL'
+
+
+class UpNode(SpecialFolderNode):
+    NODE_TYPE = 'UP'
+
+    def __init__(self):
+        super().__init__()
+        self['_id'] = 'UP'
+        self['node_type'] = self.NODE_TYPE
+
+
+class ProjectNode(SpecialFolderNode):
+    NODE_TYPE = 'PROJECT'
+
+    def __init__(self, project):
+        super().__init__()
+
+        assert isinstance(project, pillarsdk.Project), 'wrong type for project: %r' % type(project)
+
+        self.merge(project.to_dict())
+        self['node_type'] = self.NODE_TYPE