Import package in PlotWeeklyClim and PlotForecastPDF

I found some small things to be improved in PlotWeeklyClim() and PlotForecastPDF().

PlotWeeklyClim

lubricate::year is used too but only ymd() is imported (https://earth.bsc.es/gitlab/es/esviz/-/blob/main/R/PlotWeeklyClim.R#L79) Actually, I don't know if it's worth getting rid of the dependency on lubridate, which is only used in PlotWeeklyClim(). If the function can be easily replaced, we can do that. Can you take a look? Thanks.
It uses Apply(). Is it worth using Apply() or apply() can easily do the same thing? And how about the speed? If apply() is not suitable here and Apply() is slow, we can add ncores option in the function.
Minor suggestion: import only scale::date_format instead of the whole package (https://earth.bsc.es/gitlab/es/esviz/-/blob/main/R/PlotWeeklyClim.R#L75)

PlotForecastPDF

no need to import plyr twice (https://earth.bsc.es/gitlab/es/esviz/-/blob/main/R/PlotForecastPDF.R#L55)
Combine data.table import into one line

Cheers,
An-Chi