[FIX] core: modules moved or removed in Werkzeug 1.0

Those were deprecations implemented in 0.15

* all middlewares have been moved from `werkzeug.wsgi` to
  `werkzeug.middleware`, including the `SharedDataMiddleware` we use
* ProxyFix was moved to werkzeug.middleware.proxy_fix, this had
  already been fixed but I forgot the import
* sessions support was moved to a separate package
  (`pallets/secure-cookies`), however while distros are starting to
  update werkzeug to 1.0 (e.g. done on Arch, and in Debian
  Experimental) they're not bundling secure-cookies so using a
  vendored version seems like the least bad thing we can do, even more
  so as conditional dependencies are not really a thing (e.g. even
  with just pip we can't depend on secure-cookie iff werkzeug >= 1.0)

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