use a daemon thread to get water tiles instead

[code-explorer786]

this pr is untested because i'm clearly on mobile

please test this and see if the game crashes for whatever reason thanks

what is this all about

so i was playing on mobile with your mod (in a 500x500 map, unfortunately) and it suddenly gets lagspikes for some reason, and suddenly frogs appear i checked the source code and found the cause, which is checking all tiles in the main thread coincidentally, i found out about threads in Mindustry days ago, so why not

• i clearly did not test this code because i'm on mobile
• daemon threads because why not, they just get all water tiles and that's it
• thank you for your time reading this

[Br0ad]

A much good idea

[FlinTyX]

The code works just fine. Lag spikes are gone after the world is totaly loaded and the core lands. I've made some changes to the old code, so I will merge it and then push the new one (it only has some team changes and thats it, your code will stay there)