Unplugs an add-on.
|handle||The plugin handle... 0 = all plugins.
If successful, TRUE is returned, else FALSE is returned. Use BASS_ErrorGetCode to get the error code.
|BASS_ERROR_HANDLE||handle is not valid.
If there are streams created by a plugin in existence when it is being freed, the streams will automatically be freed too. Samples loaded by the plugin are unaffected as the plugin has nothing to do with them once they are loaded; the sample data is already fully decoded.