Added RVO2 library for later use in character nav w/o navmesh

modules/world/thirdparty/RVO2-3D/README.md

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+Optimal Reciprocal Collision Avoidance in Three Dimensions
+==========================================================
+
+<http://gamma.cs.unc.edu/RVO2/>
+
+[![Build Status](https://travis-ci.org/snape/RVO2-3D.png?branch=master)](https://travis-ci.org/snape/RVO2-3D)
+[![Build status](https://ci.appveyor.com/api/projects/status/ov8ec3igv588wpx7/branch/master?svg=true)](https://ci.appveyor.com/project/snape/rvo2-3d)
+
+Copyright 2008 University of North Carolina at Chapel Hill
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+<http://www.apache.org/licenses/LICENSE-2.0>
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+Please send all bug reports to [geom@cs.unc.edu](mailto:geom@cs.unc.edu).
+
+The authors may be contacted via:
+
+Jur van den Berg, Stephen J. Guy, Jamie Snape, Ming C. Lin, and Dinesh Manocha  
+Dept. of Computer Science  
+201 S. Columbia St.  
+Frederick P. Brooks, Jr. Computer Science Bldg.  
+Chapel Hill, N.C. 27599-3175  
+United States of America