Clean up `output_utils.jl`

[jbisits]

There are some functions that are related to older versions to TLDNS so need to remove these.

[jbisits]

Whilst doing this clean up makiefunctions.jl. It might be worth removing Rasters.jl as a dep here as plotting straight from the .nc files

[jbisits]

Whilst doing this clean up makiefunctions.jl. It might be worth removing Rasters.jl as a dep here as plotting straight from the .nc files

Done with #167.