Cantata qt6 version

NOTE Development is taking place in the "qt6_port" branch.

What is Cantata?

Cantata is the program that I use on my laptop to play music through my Hi-Fi (via the raspberry Pi and hard drive connected to the amplifier).

In more technical language, Cantata is a program to control an MPD (Music Player Daemon) instance. It is the piece that you use to tell the music player what you want to listen to. That implies a bunch of features to make it friendly, attractive and useable - displaying cover art, searching (for songs, artists, albums, etc), and queuing tracks.

What is this, specifically?

This is a friendly fork of a program that I have used for many years. The original author has archived the code and ceased development, and I am motivated to carry on being able to use the program for years to come. (My Hi-fi is [ahem] years old and I believe that the software part should keep running as long as the hardware does.)

The original README document gives some of the history and features of the project.

Another part of the motivation for this project is that I have been learning C++ programming and since the toolkit for the program has a new version (this is Qt5 and Qt6 now exists), it needs someone to step up and do the work updating it if it is not to fall into disuse.

I don't know for sure I can do the work, but I have made decent progress so far. I am first to have a version that compiles against qt6 (and after that, one that runs ;) ). When that is achieved, I will look to simplify the codebase - some features are obsolete and some don't interest me enough to keep maintaining them. Then, I have some ideas of things that I'd like to improve or tweak, but that is for the future.