This patch uses lilv to verify that the features listed in plugin are
supported, currently some of the new examples from drobilla don't work
due to missing worker thread. But this ensures that the plugins don't
show up in the list of plugins.
Without this patch a plugin with a feature not supported by qtractor
(eg-sampler) shows up in the list and can be added to the track, but
doesn't do anything. If you have debugging enabled on the lv2 library
you will see a message on the console when the lv2 plugin is
instantiated, but never again.
With this patch the plugin will not show up in the list of plugins,
which could be confusing, it might be better to show the plugin, but
make it unselectable with some error information in the selection
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