(SVolumeRender): fix usage of transfer functions

What does this MR do?

• Create a new service uiTF::STransferFunction instead of uiTF::TransferFunctionEditor (it also fix the swapping method and lock data).
• Improve the TF usage in visuOgreAdaptor::SVolumeRender.
• Set the sampling rate at starting of visuOgreAdaptor::SVolumeRender.
• Fix the GridProxyGeometry by avoid uniforms sharing between programs.
• Fix the makeCurrent method.

How to test it?

Try ogre viewer with an image. The volume rendering must work properly.