SystemInformation: show apps before services

The Applications information is somewhat easier to digest and
"user-friendly" in some sense, so we show that first. Then we can get
into the nitty-gritty of services and system properties after that.
DefaultTextService: remove obsolete code

This code was not only unnecessary, it actually caused the TextService
to behave erroneously, such that the format of README.md could not be
properly detected as Markdown.