Add LGPL license for CPP code and update AUTHORS

* License CPP code to LGPL so that we can be dynamically linked against.

* Remove per-file author statements in favor of global AUTHORS file

* Use contributor sorting based on git blame stats

Change-Id: Ib19fa38aadac39d86dbc32928afb1b4f3030e222
Merge "Add LGPL license for CPP code and update AUTHORS"