nanohttpd submodule for supporting local HTTP repos
This webserver is the core of the kerplapp swap local repo when used over
IP connections (WiFi). It is the smallest Java webserver we could find. It
is included as a git submodule, but then only the actual source files that
are needed are included. They are symlinked in src/.
The git repo used is the one that we submitted upstream as a pull request.
The pull request contains changes required to support https://. It has not
yet been accepted, so we cannot yet use the official repo. Once the pull
request is included, this should be switched to the latest release in the
official git repo.