Release refs/tags/v4.14.beta2-patched-snapshot_2020-11-21

latest QtCreator 4.14.beta2-snapshot + patches:

* 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 1.18 + patches:
* cxxLanguageVersion: "c++2a" is allowed. Note: It will trigger "/c++latest" for msvc
* visual studio (msbuild) project generation is more usable (still opinionated)