added command to get and set the path to the appleseed install directory
removed appleseed import hack
stylesheet is now found by searching relative to the render view file
removed threaded code
added calls to app.processEvents to keep the ui responsive
added command line argument to open the tcp port on startup
render connection window now responds to opening and closing connections even if it does not initiate them
fixed bug in removing object callbacks
added launch_render_viwer() function
implemented option to open the render viewer when an export has finished