Biicode support

This allows CppMicroServices to be published to biicode. It's currently configured to publish to [azriel/cppmicroservices](https://www.biicode.com/azriel/cppmicroservices)<sup>1</sup>. If you like, you could create an account there and publish it under that.

I haven't managed to get the tests being built when bii is used to build the library, not sure if it's possible yet

<sup>1</sup> block names can be camel case; when I first set up the block, it was mandatory to be lower case