plugins: Allow entry_points to be registered
It's currently impractical to use out-of-tree plugins that want to be distributed via distribution channels.
Poezio now looks for every entry point registered in the
poezio_plugins entry group, and will use the first matching module
with the specified name.
This also helps specifically for the OMEMO plugin that has a conflicting name (omemo / omemo) with the backend library.
Thanks jonas for pointing this out.
Signed-off-by: Maxime “pep” Buquet pep@bouah.net