Namespaces make code easier to follow, and remove the need to mangle the
beginning of function names by using ocarina_*() or libsaria_*(). In
other words: "namespaces are one honking good idea. Let's have more of
them!"
I think ocarina/ is a better name for this directory, and now that I've
named the executable "ocarina.bin" I can do this again. I also added
functions for creating a page footer with the basic controls.