Sometimes QClipboard::text() unexpectedly freezes on macOS, no known
causes for that. But before we were requesting the clipboard text after
each change in any text field to update macOS global menu items.
Now we use Cocoa API directly to find out if there were any changes to
the clipboard content and query text through Qt only if we have changes.
That way it should almost never freeze (at least) or even really never.
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.
Some major platform-dependent file operations refactoring.
All methods like "open file", "open file with", "show in folder"
were moved to core/file_utilities module with platform-dependent
backends. All methods interacting with DesktopServices made async.
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.
A regression was introduced in 1.0.12 version which led to wrong
activations of the main window: if a custom popup menu was shown
for the tray icon or a custom notification was clicked.
When we hide window by 'x' title button or by cmd+w key we try to
deactivate the whole application (so some other app gets activated).
When we activate the application in any way we check if the main
window is hidden and if it is - we show it and activate it.
Left: auto update, privacy and security, local storage box +
some minor things, like design fixes, codes like loadlang and
clearing of the local storage (box) and temp download folder.
