So I'll give a little update so you guys don't think I already gave it all up
Mobs/npcs/players now automatically spawn/despawn if you get in range/out of range
Now my problem was that there is no info on the exact spawnpoints of the mobs
So I will have to create them myself
When I thought about that i was like "oh god that will take soo fcking long w/o a tool"
So that's why I've done this little tool in Java:
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It expects a folder with all the minimap images and loads them
It also needs some mob info
And it will try to read a file with existing spawnpoints too(that's optional)
It's then possible to save all the spawnpoints/delete all/delete all on the active sector/delete a spawnpoint you selected
The red dots are normal mobs and the yellow one is the selected spawnpoint
All in all this should make adding/removing spawnpoints really easy
It will be released with the first public version as well!(incl source ofc)