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backends/drm: make output state double buffered

Xaver Hugl requested to merge work/zamundaaa/double-buffer-output into master 
When we queue output changes, the test afterwards needs to use the entire new state.
So far, it only actually tested changes in the DrmPipeline state, but a few properties
from the (Drm)Output that could make presentation fail were not actually tested.
This commit fixes that by making Output state double buffered; all getters query the
"next" state, but the old state is still stored, so that the new state can be reverted
easily.

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