Release refs/tags/v4.13.2-patched-snapshot_2020-09-30

QtCreator 4.13.2-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)