Implements first version of non blocking webserver
Fixed form uploads (multipart and urlencoded)
Implements file streaming for Webserver

Wanted to implement it very clean, but unfortunately
windows does not support filehandles for select calls
(only sockets). Used a version that may block on file
reads. But we only fill our buffer to a certain amount.
Minor clean ups in webserver modules
Fixed reading of plain request body with content-length