MapScreen.java Broken

### Issue description

I can never get my MapScreens to create due to issues in the console, and under some investigation, it seems out of my control.

### To reproduce

```
session.updateScreen(); //Update the screen.
session.screen.spawnFrames(player); //Spawn the frames.
session.screen.sendMaps(true, player); //Send the maps to the player.
```

This is my code, the `session.updateScreen()` handles the screen update and `spawnFrames(player)` SHOULD spawn the frames- but it doesn't, instead it throws a null pointer saying `this.frames` is not set. I looked into your Map Screen class and it attempts to get `this.frames[x][y]` but the `this.frames` variable was never setup within the class whatsoever, so therefore it just keeps throwing errors upon attempting to create it.

### Expected behaviour

For map screens to actually show and not throw a null pointer.

### Screenshots / videos

Look into MapScreen.java to see what I mean, it's pretty self-explanatory, but here's the log as well I keep getting.
`java.lang.NullPointerException: Cannot load from object array because "this.frames" is null
at com.legacymc.legacyrp.libraries.maps.api.MapScreen.spawnFrames(MapScreen.java:191) ~[LegacyRP-0.0.1.jar:?]`

### Additional information

_No response_

Start with MapScreen.java, especially spawnFrames at line 191, and reproduce the failure using the session.updateScreen(), spawnFrames(player), and sendMaps(true, player) sequence. Trace where frames should be initialized before the this.frames[x][y] access. Done means map screens display without the reported NullPointerException.

Written by the indexing model from the issue text.