Clean payload of weirdness

Weird characters where creeping in at the end of FAA data (#13 and #18)
Added a sanitization code to cleared them up before using the data

Important corrections

Added logging of downloaded data to assist with troubleshooting when required

Corrected handling of natTrak to cope with half degree coordinates

Improved handling of half degree coordinates on FAA data

Modified geoBox up to 1E to cope with waypoints at long 0

Major implementation 2.0

Implementation of a button to select data source between FAA (default) and natTrak - available on the menu via .natoptions
When changing data source, info is automatically reloaded

Implementation of a euroNAT.log file, removing the logging from EUROSCOPE onto a file - only Warnings will be displayed on EUROSCOPE, with details on the .log file

Use new FAA json

updated code to extract from https://nms.aim.faa.gov/datanat/nat.json

Modified handling of ISEC.txt

Created some logics for the handling of the ISEC.txt
Now it does NOT need to be shared with the dll, as it will simply search the NAVDATA folder
ATTENTION! This means that the .dll needs to be on [YourSector]\Plugins\EuroNat folder, as for now this is how I set up the logic

By doing so, it will automatically copy the GNG ISEC.txt that comes from the [YourSector]\NavData folder!

If it doesn't find it anywhere, it will warn the user about it

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Created a box between 30N and 90N, 70W and 1W for searching the waypoints on the ISEC.txt
This should solve the issues of the first waypoint found not being relevant for the NAT tracks common airspace

Corrected name of Half degree

Correct the waypoint naming of half degree
Correct handling of waypoint.txt not found

Make sure you have a ISEC.txt file on the same folder of the .dll (copy one from your sector NAVDATA folder)

Fix half degree handling

This fixes wrong half degree handling. Still to be optimized in terms of code, but works

Fix change of url for Track message

Released dll with new FAA NAT message location