devel/cscout: unexpire and update to 3.01

• Leave out the DOCS option for now because the required conversion of XML to HTML has not been figured out yet.
• No more dependency on compat6x
• Fetch sources from GitHub
• update license to GPLv3

PR: 242402
Submitted by: Joachim Werner
Approved by: maintainer (dds@)
MFH: 2020Q2