Indenting
Add audiofile as project submodule
Build libaudiofile with CMake
Big cleanups to CMakeLists for project

- Don't use file globs (Kitware apparently does not recommend this)
- Use more common code blocks
- Indenting
Fix compiler warning
Merge branch 'audiofile'

* audiofile:
  Fix compiler warning
  Big cleanups to CMakeLists for project
  Build libaudiofile with CMake
  Add audiofile as project submodule