Optimize radar rendering

[rfresh2]

Profiling indicates ~50% reduced CPU time and memory allocations

Caches expensive operations where we iterate over all chunks in a radius and removes unnecessary vector object allocations.

[rfresh2]

for the record, I still recommend using https://github.com/rfresh2/XaeroPlus instead of lambda radar. but some people are stubborn lol

[Luna5ama]

If you want optimization, just throw away the objects list and store raw float. It trolls the GC.

[rfresh2]

If you want optimization, just throw away the objects list and store raw float. It trolls the GC.

for shore, also the circle rendering could use similar optimizations too