Install OSL headers
Added OSL entities to project schema
Merge branch 'master' into OSL_merge
Merge branch 'master' into OSL_merge
Added OIIO error handler, renderservices & OSL init improvements
Added oslc placeholder
small improvements to oiioerrorhandler, fixed some comments in masterrenderer
Fixed PR comments.
Merge pull request #289 from est77/OSL_merge

OSL merge 1
fixed minor coding and styling issues.
removed deprecated parameter.
cosmetics.
fixed compilation in Debug.
reuse OIIO's texture system
Merge branch 'master' into OSL_merge
Formatting fixes
Pass OSL's shading system to the scene's on_frame_begin / end
Removed oslexec include
fixed OSL ifdefs indentation
fixed indentation