Implement DirectComposition support, as well as return Win8+ window transparency #13382
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What does the pull request do?
Add DirectComposition support + refactors support of different composition-like connections (dcomp, winui...).
Updates transparency levels support matrix:
* - DComp and WinUI windows are always transparent, but we still can render visuals to make it opaque.
** - It is possible to support Gaussian Blur with DComp, but not implemented in this PR.
Previously in 11.0 builds Transparent window was supported only with GPU and WinUI enabled.
Fixed issues
Fixes #13381
Closes #12285