Windows: Add public defer method #144
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This solves #143 in a better way than #130 did. It lets downstream crates defer tasks until the end of the current main loop cycle in order to prevent "already borrowed" errors because of multiple mutable borrows of the window state.
I added this method for Windows only because this is the only OS where baseview uses RefCells and the only OS for which the
deferred_taskqueue has been implemented (in #136).