* Allow user to specify location of cty.dat file.
* Use specified cty.dat path to also locate
lotw1.txt and AGMemberList.txt
* Allow user to reload the file(s) if updated while fldigi
is running or the location is changed.
* This change allows multiple instances of fldigi to use a
single, manageable, installation of the files
- cty.dat
- lotw1.txt
- AGMemberList.txt
The three files must be co-located in a single folder.
* Use unordered_maps (or hash_maps on ancient gcc4 versions)
* Store the spot callbacks such that RE searching is minimised
* Store list of country names