Texture context selector for texture panel:

* Texture context was previously determined by going to the appropriate panel, for example "world panel -> texture panel" to access world textures. Additionally there was a separate button to access brush textures.
* Now the texture context can be selected directly through an expanded icon menu, which shows the available context options.
* This context selector is now at the top of the texture panel, but this could later be perhaps integrated to the context path somehow to be more intuitive.

release/scripts/ui/properties_texture.py

@@ -99,6 +99,9 @@ class TEXTURE_PT_context_texture(TextureButtonsPanel, bpy.types.Panel):
         if not isinstance(pin_id, bpy.types.Material):
             pin_id = None
 
+        if not space.use_pin_id:
+            layout.prop(space, "texture_context", expand=True)
+
         tex_collection = (pin_id is None) and (node is None) and (not isinstance(idblock, bpy.types.Brush))
 
         if tex_collection:
@@ -126,9 +129,6 @@ class TEXTURE_PT_context_texture(TextureButtonsPanel, bpy.types.Panel):
 
         col = split.column()
 
-        if not space.pin_id:
-            col.prop(space, "show_brush_texture", text="Brush", toggle=True)
-
         if tex:
             split = layout.split(percentage=0.2)