Initial commit

added libraries:
opus
flac
libsndfile

updated:
libvorbis
libogg
openal

- Everything works as expected for now. Bare in mind libsndfile needed the check for whether or not it could find the xiph libraries removed in order for this to work.

Engine/lib/libsndfile/README

@@ -0,0 +1,74 @@
+libsndfile is a library of C routines for reading and writing
+files containing sampled audio data.
+
+The src/ directory contains the source code for library itself.
+
+The doc/ directory contains the libsndfile documentation.
+
+The examples/ directory contains examples of how to write code using
+libsndfile.
+
+The tests/ directory contains programs which link against libsndfile
+and test its functionality.
+
+The src/GSM610 directory contains code written by Jutta Degener and Carsten
+Bormann. Their original code can be found at :
+    http://kbs.cs.tu-berlin.de/~jutta/toast.html
+
+The src/G72x directory contains code written and released by Sun Microsystems
+under a suitably free license.
+
+The src/ALAC directory contains code written and released by Apple Inc and
+released under the Apache license.
+
+
+LINUX
+-----
+Wherever possible, you should use the packages supplied by your Linux
+distribution.
+
+If you really do need to compile from source it should be as easy as:
+
+		./configure
+		make
+		make install
+
+Since libsndfile optionally links against libFLAC, libogg, libvorbis and
+libopus, you will need to install appropriate versions of these libraries
+before running configure as above.
+
+You can use CMake now to build under Linux, also under Windows and MacOS, see
+README.md for details. CMake toolchain is usable, but still exterimental.
+
+
+UNIX
+----
+Compile as for Linux.
+
+
+Win32/Win64
+-----------
+
+Official Windows binaries are compiled with Autotools and MinGW, but you can use
+CMake to generate solution for Visual Studio. Details are described in
+README.md.
+
+It is still recommended to use the libsndfile binaries available on the
+libsndfile web site.
+
+MacOSX
+------
+Building on MacOSX should be the same as building it on any other Unix.
+
+
+CONTACTS
+--------
+
+libsndfile was written by Erik de Castro Lopo (erikd AT mega-nerd DOT com).
+The libsndfile home page is at :
+
+	http://libsndfile.github.io/libsndfile/
+
+Bugs and support questions can be raised at :
+
+	https://github.com/libsndfile/libsndfile/issues