Merge pull request #544 from est77/master

Fixed error when trying to copy import libs to sandbox.
cosmetics.
Merge pull request #545 from est77/master

Fixed simple glass OSL test scene.
fixed a subtle crash on Windows.

appleseed.studio would crash when deallocating a std::string allocated by appleseed.dll.  The std::string should really have been allocated by appleseed.studio, however it turns out that inline methods in DLL-exported classes are not really inline, in our case meaning the std::string was really allocated inside appleseed.dll.
Merge branch 'master' of github.com:appleseedhq/appleseed
appleseed.package.py 2.3.11: include osl and oiio utilities in package.
fixed deployment of import libraries to sandbox\lib\ on windows.
bug fix: texture maps were flipped when using the Disney material.
added .gitignore to sandbox\lib.
added screenshots.
small tweaks.
small tweak.
renamed platforms.
renamed a method.
minor optimization.
code simplification.
cosmetics.
appleseed::studio::CameraController now emits signals when the camera starts or stops changing.
the Tangent and Bitangent modes of the diagnostic surface shader are now based on the actual tangent vectors instead of dP/du and dP/dv.
AOV images are no longer restricted to 4 channels.