Optimization stuff

See merge request !4

ESP8266 do not support threading.
https://github.com/micropython/micropython/issues/3667

This reverts commit 540ef7be.

You can now add python files with a sample(vec, t) function that has to return
a tuple like this: (0.0, 0.0, 0.0) to create your own shader.

esp: cleanup code. optimize memory and speed

See merge request !2

Add host id in data header

See merge request !1