Deprecated Normalise effect and replace it with Loudness
@azulinho so had a closer look at this normalize stuff. In fact as 'Normalize' we use the MLT 'volume' effect which has this unusal dual db/% parameter. Shotcut uses the more recent/probably better 'loudness' and 'dynamic_loudness' effects. These effects are also in Kdenlive under the 'Loudness' and 'Dynamic loudness' names. So best thing is probably to rename / move our current normalise effect as deprecated and rename Loudness* to Normalize?