Register signal handlers in development mode

This allows keeping the session when the development server restarts
due to changes. It works fine with waitress and hupper.

Author: Cito

webware/Configs/Application.config

@@ -129,5 +129,6 @@ UnknownFileTypes = {
 
 OutputEncoding = 'utf-8'
 ResponseBufferSize = 8 * 1024  # 8 kBytes
+RegisterSignalHandler = Development
 RunTasks = True
 WSGIWrite = True  # use write callable with WSGI