create new "get atcf"

[wwlwpd]

1. robustness above all
2. use of https rather than ftp
3. pull parameters from run.properties instead of using command line options
4. separate the acquisition of the index-at.xml from the parsing out of the actual forecast/advisory text from the index-at.xml file
5. enable additional sources (beyond "filesystem"); would be nice to acquire atcf files via scp
6. maybe include an additional format for the advisories, e.g., the json source you mentioned
7. move the readFileAsHash, writeHashToFile, printHash, and stderrMessage out of the individual perl scripts and into a common asgs perl helpers module that our different perl scripts can use
8. monitorability (logging) throughout
9. use the basin, storm number, and year rather than the storm name to ID the data we are looking for
10. maintain existing get_atcf.pl script and make it easy swap them out

[wwlwpd]

JSON link is being produced this year at https://www.nhc.noaa.gov/CurrentStorms.json - I recommend we monitor what's available via this method and consider supporting it, but treat it as still an "experimental" product from NHC.