Hints for chatty in main

Warnings

• asv-mimetypes-tag-deprecated
  sm.puri.Chatty.metainfo.xml:87 -
  The toplevel `mimetypes` tag is deprecated. Please use `mediatype` tags in a `provides` block instead to indicate that your software provides a media handler for the given types.
• asv-custom-key-duplicated
  sm.puri.Chatty.metainfo.xml:118 - Purism::form_factor
  A key can only be used once.
• asv-desktop-app-launchable-missing
  sm.puri.Chatty.metainfo.xml -
  This `desktop-application` component is missing a `desktop-id` launchable tag. This means that this application can not be launched and has no association with its desktop-entry file. It also means no icon data or category information from the desktop-entry file will be available, which will result in this application being ignored entirely.