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Fix opengl depth format errors with hardware buffers

Ken Martin requested to merge ken-martin/vtk:opengl_fix_hardware_depth_blit into master

Blitting the depth buffer to a hardware buffer may fail if the hardware depth format differs from what VTK is using in it's framebuffers. Change the code to do a texture render instead for the BlitDisplayFramebufferToHardware

Add access to the framebuffers depth texture object into vtkOpenGLFramebufferObject

Closes #18278 (closed)

Edited by David Gobbi

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