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Also revise how the renderpass is handled when wrapping a QVulkanWindow.

Compiles again.

While we are at it, rename QRhiRenderPass to QRhiRenderPassDescriptor
because renderpass on its own is a somwhat misleading naming.

...and add the - for now - unused buildCompatibleRenderPass functions.

Another step towards more independent renderpass handling in the api.

this will come handy later

...as that's the wrong place to have them.

It is for internal use only.

...and fix the license headers while we are at it.