[Builder / RenderPather] BREAKING remove aliases to old names

examples/tutorial/README.md

@@ -17,7 +17,7 @@ Contents
     * Build hierarchical photonic-crystal example devices
     * Reference other patterns
     * Add ports to a pattern
-    * Use `Builder` to snap ports together into a circuit
+    * Use `Pather` to snap ports together into a circuit
     * Check for dangling references
 - [library](library.py)
     * Continue from `devices.py` using a lazy library
@@ -29,7 +29,7 @@ Contents
     * Use `AutoTool` to generate paths
     * Use `AutoTool` to automatically transition between path types
 - [renderpather](renderpather.py)
-    * Use `RenderPather` and `PathTool` to build a layout similar to the one in [pather](pather.py),
+    * Use `Pather(auto_render=False)` and `PathTool` to build a layout similar to the one in [pather](pather.py),
         but using `Path` shapes instead of `Polygon`s.
 - [port_pather](port_pather.py)
     * Use `PortPather` and the `.at()` syntax for more concise routing