Release refs/tags/v4.13.3-patched-snapshot_2020-10-24

latest QtCreator 4.13.3-snapshot + patches:

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