Hints for portfolio-filemanager in main

Hints

• asv-description-first-para-too-short
  dev.tchx84.Portfolio.metainfo.xml:39 - A minimalist file manager for those who want to use Linux mobile devices.
  The first `description/p` paragraph of this component might be too short (< 80 characters). Please consider starting with a longer paragraph to improve how the description looks like in software centers and to provide more detailed information on this component immediately in the first paragraph.
• asv-developer-name-tag-deprecated
  dev.tchx84.Portfolio.metainfo.xml:134 -
  The toplevel `developer_name` element is deprecated. Please use the `name` element in a `developer` block instead.
• asv-relation-control-in-requires
  dev.tchx84.Portfolio.metainfo.xml:165 -
  Found a user input control relation in a `requires` tag. This means users will not be able to even install the component without having the defined input control available on the system. This is usually not intended and you want to use `control` in the `recommends` tag instead.