base::lambda -> Fn (type alias for std::function).
base::lambda_once -> FnMut (type alias for base::unique_function).
base::lambda_guarded -> crl::guard.
base::lambda_call_type_t -> crl::deduced_call_type.
We had several reports about wrong values in registry on Windows 8.1,
like the quiet hours are enabled and all notifications are skipped,
without anything like that being enabled in Windows settings.
Currently the build without implicitly included precompiled header
is not supported anyway (because Qt MOC source files do not include
stdafx.h, they include plain headers).
So when we decide to support building without implicitly included
precompiled headers we'll have to fix all the headers anyway.
Now each platform-dependent module declares its interface in
platform/platform_module.h file and after that includes platform-
specific headers like platform/win/module_win.h with implementation.
Also removed the legacy WinRT platform-dependent implementations.
Sometimes the windows quiet hours registry key gets set even in
Windows 7 (or older) and we disable notifications though it has
nothing to do with real user settings. Check for 8.1 at least.
