Fix/ip2 country out of memory

[ThomasSession]

Helping with the out of memory crash we are getting from the playstore:
https://play.google.com/console/u/0/developers/8294769987979883884/app/4974570314892392602/vitals/crashes/a4b76784091e144fe86ab5a64cb86295/details?days=28&versionCode=3795%2C3785&isUserPerceived=true

Avoid memory allocation in the ipv4Int logic and avoiding reading the whole csv file.

[simophin]

Neat! One nitpick I have is about the manual closing of Closable, there's a use that is perfect suited for this occasion. So instead of this:

 val csv = CSVReader(FileReader(file.absoluteFile)).apply {
            skip(1)
        }

        val ipCountries = csv.asSequence().associateTo(TreeMap()) { cols ->
            Ipv4Int(cols[0]) to cols[1].toIntOrNull()
        }

        csv.close()

        ipCountries

You can do this:

        CSVReader(FileReader(file.absoluteFile)).use { csv ->
            csv.skip(1)
  
            csv.asSequence().associateTo(TreeMap()) { cols ->
                Ipv4Int(cols[0]) to cols[1].toIntOrNull()
            }
        }

It'll make sure the close is always called even if there's an exception in between

[simophin]

Nice!