IPFS support

[wolfv]

It could be cool to have ipfs support.

I think basic support could be quite straight forward if a ipfs daemon is running. The ipfs daemon does expose a regular HTTP API, so we could use for example this endpoint to download a given file using our curl implementation.

There is also another project https://github.com/vasild/cpp-ipfs-http-client that is implementing a C++ client based on curl that we could use for inspiration.

cc @vasild maybe you're interested in the powerloader project?