Release ReText as AppImage

[TheAssassin]

Providing an AppImage would have, among others, these advantages:

• Applications packaged as an AppImage can run on many distributions (including Ubuntu, Fedora, openSUSE, CentOS, elementaryOS, Linux Mint, and others)
• One app = one file = super simple for users: just download one AppImage file, make it executable, and run
• No unpacking or installation necessary
• No root needed
• No system libraries changed
• Works out of the box, no installation of runtimes needed
• Optional desktop integration
• Optional binary delta updates, e.g., for continuous builds (only download the binary diff) using AppImageUpdate
• Can optionally sign your AppImages (inside the file) using gpg2
• Works on Live ISOs
• Can use the same AppImages when dual-booting multiple distributions
• Can be listed in the AppImageHub central directory of available AppImages
• Can double as a self-extracting compressed archive with the --appimage-extract parameter

Here is an overview of projects that are already distributing upstream-provided, official AppImages.

I have set up a little repo containing a script for building working ReText AppImages for x86_64 computers. Please see https://github.com/TheAssassin/retext-appimage.

[TheAssassin]

Demo AppImage available on the release page: https://github.com/TheAssassin/retext-appimage/releases