Pagination

[ethanharstad]

Backend is returning too many results, implement pagination

• [x] Backend pagination
• [x] Frontend pagination support
• [x] Soundings pagination
• [x] Centers pagination
• [x] Towers pagination
• [x] Navaids pagination

[ethanharstad]

Nevermind, lets not paginate centers. There are few enough of them anyway and it will be beneficial to see them all on the map at once.