Multiple additions and fixes contributed

Version 20210425

Multiple additions and fixes contributed by Edward Weymouth in #1:

• Added airport SDWQ/Alenquer Airport, BR
• Fixed spelling for RJAN/Niijima Airport
• Added iata entry for KOSA/Mount Pleasant Regional Airport
• Added iata entry for YLIM/Limbunya Station Airport
• Added iata entry for KFFO/Wright Patterson
• Added iata entry for RJAN/Niijima Airport
• Added iata entry for KCIN/Arthur N Neu Airport
• Added iata entry for KTOR/Torrington Municipal Airport
• Added iata entry for KSAC/Sacramento Executive Airport
• Added iata entry for PADM/Marshall Don Hunter Sr Airport