Update OSL headers in sandbox upon changes
Update OSL headers in sandbox upon changes

Header files are now properly updated in the sandbox if they changed in the sources.

aytekaman/appleseed,Biart95/appleseed,Aakash1312/appleseed,pjessesco/appleseed,aytekaman/appleseed,glebmish/appleseed,luisbarrancos/appleseed,Aakash1312/appleseed,est77/appleseed,Vertexwahn/appleseed,appleseedhq/appleseed,appleseedhq/appleseed,dictoon/appleseed,glebmish/appleseed,dictoon/appleseed,pjessesco/appleseed,dictoon/appleseed,pjessesco/appleseed,Biart95/appleseed,Vertexwahn/appleseed,Vertexwahn/appleseed,gospodnetic/appleseed,appleseedhq/appleseed,Biart95/appleseed,appleseedhq/appleseed,Aakash1312/appleseed,Biart95/appleseed,Biart95/appleseed,glebmish/appleseed,pjessesco/appleseed,est77/appleseed,Vertexwahn/appleseed,est77/appleseed,Aakash1312/appleseed,aytekaman/appleseed,luisbarrancos/appleseed,gospodnetic/appleseed,gospodnetic/appleseed,est77/appleseed,luisbarrancos/appleseed,est77/appleseed,gospodnetic/appleseed,glebmish/appleseed,aytekaman/appleseed,Vertexwahn/appleseed,luisbarrancos/appleseed,glebmish/appleseed,aytekaman/appleseed,dictoon/appleseed,appleseedhq/appleseed,gospodnetic/appleseed,Aakash1312/appleseed,luisbarrancos/appleseed,pjessesco/appleseed,dictoon/appleseed