Add the system call outputDebugString.

This doesn't do anything on retail consoles, but homebrew developers can use it to debug applications in Citra or in other 3DS emulators which HLE this system call.
Merge pull request #15 from neobrain/refactor

Add the system call outputDebugString.
Merge branch 'refactor' of github.com:smealum/ctrulib into refactor
Merge branch 'refactor'