* Alias PyQt5 to PyQt6 on PyQt6 builds
Restores basic compatibility with PyQt5 add-ons
* Register QtCore early to work around sip error
* Monkey-patch unscoped enums that are in use by add-ons back in
Enums whose namespace moved with PyQt6 were determined using the tooling in https://github.com/qutebrowser/qutebrowser/issues/5904
Relevant enums for the Anki add-on ecosystem were found by grepping through all AnkiWeb add-ons and a selection of GitHub-released add-ons.
* Add full Qt.Key namespace
Maintains compatibility with add-ons that allow specifying key bindings via Qt.Key enums
* Reintroduce PyQt6.Qt as an alias for QtCore.Qt
* Alias classes shifted from QtWidgets to QtGui
* Add missing enums
Adds ≈200 enums that were missed during the initial grep
* Map exec_ calls to exec
* Tweak section headers
* Fix QtWebEngineWidgets imports failing due to delayed import
Addesses: "QtWebEngineWidgets must be imported before a QCoreApplication instance is created"
* Register additional aliases for top-level Qt modules
Given how we have had to deal with side-effects when not registering other aliased imports ahead of time, it seems safer to also register the remaining few with sys.modules.
* Handle calls to deprecated PyQt resource API graciously
* Create QtWebEngineWidgets aliases for classes moved to QtWebEngineCore
* Alias QShortcut
* Restore QWebEnginePage.view()
* Alias sip to PyQt6.sip
* Alias QtCore.QRegExp to QtCore.QRegularExpression
* Restructure aqt.qt into package
Pre-requirement for aliasing the PyQt5.Qt namespace correctly.
Should hopefully also make it easier to keep an overview as Qt-compat-related modules were proliferating.
* Properly alias PyQt5.Qt
PyQt5.Qt used to serve as a common namespace for all Qt classes, not just QtCore.Qt.*
While this changes does not make all classes accessible via PyQt5.Qt, it does so for the most important Qt submodules, which should cover most add-on breakages.
* Simplify Qt resource system legacy handling
* Also alias PyQt6.Qt
Covers imports of the form `from PyQt5 import import Qt` (due to previous aliasing of PyQt5 to PyQt6)
* Add missing enums
Better approach to grepping through add-ons yielded additional hits
* Run formatters
* Satisfy pylint
