[Therion] Mapiah, again

[Rodrigo Severo]

Hi,

Here I am again with Mapiah. Now I believe we have an already usable version of Mapiah. You can find it at https://github.com/rsevero/mapiah

Currently there is a Linux flatpak and a web release:

- Linux: flatpak install io.github.rsevero.mapiah; flatpak run io.github.rsevero.mapiah
- Web: https://mapiah.org/webapp

If someone is interested in creating a Windows, MacOS or another flavor of Linux package and want help, please contact me.

Some interesting characteristics of Mapiah:

- Visually distinguish all point, line, and area types supported by Therion.
- Graphical interface for editing all supported options of points, lines, and areas supported by Therion.
- Multiple mouse and keyboard pan and zoom options.
- On save, original file lines are only changed if an actual edit modified them, which facilitates version control management.
- Uses Therion as the source of truth regarding supported features; i.e., if Therion supports it, Mapiah should support it as well.

- As a secondary effect, tries to update and detail the Therion Book so it better reflects Therion features.
- Equivalent versions for Linux, Windows, MacOS, and web.
- Unlimited undo/redo.
- Redos available after some undos and new actions merged in the undo queue.

Please try it and let me know what you think about it.

Regards,

Rodrigo
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