Hints for gr-funcube in main

Warnings

• asv-cid-is-not-rdns
  dl1ksv.gr-funcube.metainfo.xml:3 - dl1ksv.gr-funcube
  The component ID is required to follow a reverse domain-name scheme for its name. See the AppStream specification for details.
• asv-spdx-license-unknown
  dl1ksv.gr-funcube.metainfo.xml:5 - GPL-3+
  The license ID was not found in the SPDX database. Please check that the license ID is written in an SPDX-conformant way and is a valid free software license.