Jacalz/rymdport v3.5.3

Fixing Flathub review comments and updating dependencies

on GitHub

This is a patch release containing various updates to icons, screenshots and metadata to fix issues needed to better comply with Flathub guidelines. There are also some dependency updates for many performance improvements and bug fixes. Lastly, there are updates to the documentation around contributing and packaging.

This will likely be the last v3.5.x release. Work on v3.6.0 is ongoing in the next branch. See the list of closed issues in the v3.6.0 milestone for a glimpse of what will be included.

Changelog:

• Updated icons, screenshots and appstream metadata to fix problems noted in Flathub review (see #139).
• Updated fyne to v2.4.4.
  • This brings various bug fixes and some sizeable performance improvements.
• Updated compress to v1.17.7.
  • Decompression performance for directory transfers is improved slightly.
• Update fyneselfupdate to v0.1.1.
  • This removes some usage of deprecated functions and cleans up the code. Nothing major.
• Some improvements to documentation.
  • Some incorrect wording and textual errors were fixed in CONTRIBUTING.md.
  • Information on how to build distribution packages (for Linux repositories etc.) was added in a new PACKAGING.md file.