Release refs/tags/v5.0.0-beta1-patched-snapshot-2021-07-10

* 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 1.19.2 snapshot + patches:
* fixed Qt6.0 support on Windows
* cxxLanguageVersion: "c++2a" is allowed. Note: It will trigger "/c++latest" for msvc
* visual studio (msbuild) project generation is more usable (still opinionated)