Fix rainbow component

[Teero888]

This fixes the several divisions by 0, the broken pulsing option and the unnecessary loop over all players even if rainbow isn't enabled + overall style.

Checklist

• Tested the change ingame
• Provided screenshots if it is a visual change
• Tested in combination with possibly related configuration options
• Written a unit test (especially base/) or added coverage to integration test
• Considered possible null pointers and out of bounds array indexing
• Changed no physics that affect existing maps
• Tested the change with ASan+UBSan or valgrind's memcheck (optional)

[BlaiZephyr]

Teero fixes style

Has ci fail because of style

[Teero888]

Teero fixes style

Has ci fail because of style

my changes don't make the ci fail xd
look at the details

[BlaiZephyr]

Teero fixes style
Has ci fail because of style

my changes don't make the ci fail xd look at the details

I would never, my comments are based off pure subjective hatred against ci's

[sjrc6]

nice