[ReactorCraft][Suggestion] add a neutron detector block compatible with OpenComputers

[Konrad-Wszelaki]

Some time ago I wanted to experiment around with how often a filled fuel rod emits neutrons (and later on - how many are absorbed by another fuel rod and cause fission), so I devised a plan to use neutron absorbers connected to an OC computer and writing a script that detects when the absorber increases in temperature.

To my utter disappointment this did not work, as the neutron absorber never gained any heat.

I took a look into the source code and noticed that the absorber only heats up from fusion neutrons, so clearly this is an intended behaviour, but having a block that can detect all types of neutrons and that can be interacted with via OC could be a cool way to allow for experimentation with nuclear power without much risk of a meltdown.

In order not to risk the block being better than the neutron absorber at absorbing all the neutrons it could either heat up and require cooling or simply detect neutrons as they pass without actually stopping them.