Hints for librecad in main

Hints

• asv-developer-name-tag-deprecated
  org.librecad.librecad.appdata.xml:27 -
  The toplevel `developer_name` element is deprecated. Please use the `name` element in a `developer` block instead.
• asv-developer-info-missing
  org.librecad.librecad.appdata.xml -
  This component contains no `developer` element with information about its author.