Proposal: Add AllowsTransparency option for Window and no Background

[NickeManarin]

Proposal: Add AllowsTransparency option for Window

Summary

One missing feature from WPF is the capability of creating our own Window style by using the AllowsTransparency option along with setting the Background="{x:Null}".
This enables the creation of a window without normal window controls such as resize, close, drag, etc., also enabling click through in transparent areas. (WS_EX_LAYERED + UsesPerPixelOpacity)

Rationale

• Enables the creation of click through windows, for apps which use special UIs, such as screen recorders.

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