Make Cocoa context-view connection before MakeCurrent

David Gobbirequested to merge
dgobbi/vtk:context-before-makecurrent into master

Because vtkOpenGLRenderWindow::Start() calls MakeCurrent(), it must be moved until after vtkCocoaRenderWindow::Start() has done all of the context setup. This brings the order of operations in line with vtkXOpenGLRenderWindow.

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