While the source is C++, it doesn't use anything from the C++
runtime, so by building with -fno-exceptions -fno-rtti, the
dynamic library doesn't have to be linked to libstdc++. This
also simplifies things for users of the static library.

These correspond to different VBR modes.

This avoids name clashes with the similarly named files in
libSBRdec, when building all libraries with one single
automake file.

Change-Id: If97c7482bffaab4a21cd2fb8341f2939f19d3bbd

Change-Id: I9d9ab17121e2db58f8a4ba4b40e14cab629b1a7e

Change-Id: I42a702487e6db4953dca0027710ea4fe266052fd
Also:
 - Removed dead code in several source files.
 - Minor changes in comments.
 - No functional changes. No changes in executed code.
 - Added documentation PDFs.

Fixes:
- Don't throw error for invalid bitrate but limit to functional value
- More robust ASC parsing
- More robust handling of corrupt bitstreams
- Handle multiple raw access units

Change-Id: Ib49fe2545ff4185fe924126da702fe84ac5c2d87

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5