Add `sounds.h`, C array versions of sound files

This enables us to compile the sound files into our binary.

Makefile:
Add a target to build the `sounds.h` file, by running `xxd -i` on both
sound files.

Thanks to Matteo Italia
(https://stackoverflow.com/users/214671/matteo-italia) on Stack Overflow
for describing how to use `xxd -i` to create a C array from a binary
file:
https://stackoverflow.com/questions/8707183/script-tool-to-convert-file-to-c-c-source-code-array/8707241#8707241

An to John Marshall
(https://stackoverflow.com/users/280577/john-marshall) on Stack Overflow
for showing me the Make `foreach` function:
https://stackoverflow.com/questions/7918511/make-execute-an-action-for-each-prerequisite/7921168#7921168

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