Release refs/tags/v5.0.1-patched-snapshot-2021-09-11

latest QtCreator 5.0.1 snapshot + patches:

* Improved QML/JS formatting
* Fixed MSVC output window link parsing
* Support for trailing return types in quickfixes
* Qbs Action to debug with Visual Studio
* Qbs Action to generate Visual Studio 2019 project
* extended macro expander for ActiveProject and CurrentTarget
* suppress pragma once warnings in headers
* error navigation in compile output window
* display snapshot version in about dialog
* properly indented line comments
* no jump to task list after build errors
* use patched qbs for Windows build
* use "c++2a" (gcc/clang) / "c++latest" (msvc) from qbs for clang code model

Qbs v1.20.0 patched snapshot 2021-09-01
* Usable msbuild project generator
* C++2b and C++2a support for msvction is more usable (still opinionated)