- rename build artifact names and distribution archive names
- this step completes file name related changes (based on extension, more may come based on "qb64" string)
If a user has Homebrew installed, calling g++ won't use Apple's Xcode version of the tool, which is required by QB64. This fix continues on with the patch introduced in 4dbdddc89e.
Extra "osx" references replaced with "macOS", but nothing substantial (almost aesthetic).