Irrlicht Engine full changelog

- Tests on Unix now have a short pause between switching drivers to avoid certain X11 errors.
- Fix CEnumAttribute::getInt() which could crash (thx @ luthyr for reporting)
- No longer try to run tests for drivers not supported on a platform
- Update lights and renderTargetTexture tests to work with Windows 10 (can't have so tiny Windows anymore).
- Deprecate CMatrix4::transformBox as the result is no longer a boundingbox. Use CMatrix4::transformBoxEx instead (which has been available for a long time).
- Fix CSceneCollisionManager::getPickedNodeBB which could sometimes miss collisions.
- Add -U__STRICT_ANSI__ option to c::b project files to allow compiling with -std=c++11 and add an error when trying to compile with Irrlicht with __STRICT_ANSI__
- Update libpng to 1.6.23
- Update zlib to 1.2.8
- Fix some compile warnings in aes which got handled as errors by some c++11 compilers.
- Get rid of some misleading-indentation warnings in gcc6
- Fix serialization of the InputReceiverEnabled

The zip-file for Irrlicht 1.8.1 got uploaded once more. As our watchful forum member ent1ty noticed the version number in the Makefile had still been set to 1.8.0. Which resulted in wrong library names on Linux for the shared library. No other changes since last upload. Thanks for the report and sorry for the inconvenience

* New loaders for mdl, wal, smf
* Cg support
* Support for custom hardware cursors
* Improved support for 64-bit platforms
* Major OSX device improvements
* Occlusion culling
* Improved collada support
* Improved shadows
* Polygon offset support
* ISceneLoader interface
* Supporting now MSVC 2010 and 2012
* New versions of support libraries
* Video driver attribute query interface
* Increased stability (lots of bugfixes!)

- Menu no longer sets highlight state when clicking disabled menu-item (reported by Mloren)
- Treeview can now be disabled

- Fix string::remove which got in an endless loop when remove was called with an empty string (found and fixed by Ulf)
- Correctly release the GLSL shaders
- Make sure we only release an X11 atom when it was actually created
- Fix aabbox collision test, which not only broke the collision test routines, but also frustum culling, octree tests, etc.

- Fix compilation problem under OSX due to wrong glProgramParameteri usage
- mem leak in OBJ loader fixed
- Removed some default parameters to reduce ambigious situations