Embed resources

[lambdafu]

If we are serious about the "portable app" concept of providing a single binary, we need to embed some resources into the binary.

• The translations (mo files). boost::locale::message supports this
• The SKS Poolserver root certificate (sks-keyservers.netCA.pem).

Here is a helper binary and cmake/boost integration: https://github.com/cyrilcode/embed-resource