Fixture Definition Editor - Duplicate Button instead Copy Paste Channel

[Fede79]

In Fixture Definition Editor in the channels box why not just add the duplicate channel button instead of pressing the copy channel button and then pressing the paste button to add the copy

[MichelSliepenbeek]

Considering that:
- QLC+ already comes with a lot of Fixture Definitions,
- if a Fixture Definition is missing, you only use the Fixture Definition Editor once (if you don't make mistakes),
- you now need to press two buttons to copy a Channel,
it is not a major improvement to optimise this by reducing it to "one press on a button".

I would prefer the QLC+ development team to give priority to complete QLC+ V5 first