Merge pull request #11 from altendky/maybe

maybe

Merge pull request #6 from altendky/add_qt6

Merge pull request #5 from altendky/add_macos

only build 5.15.2

Merge pull request #1 from altendky/rework_dependency_spec

rework dependency spec for applications

switch to qt5-tools main entry point and subcommands for each applica…

…tion