Reactor: extreme mode

[EmingK]

This is a performance boost for extreme conditions to handle up to 8 reactor instances.

Current single instance check process:

• Read heat temp (indirect method, 1 tick)
• Check reactor items (read inventory, 1 tick)

For an instance to boot, also need:

• Redstone signal up/down (indirect method, 1 tick)

For 8 instance to startup 24 gt is consumed, this lead to a timeout.

Proposed solution

• Make redstone signaling global, unified control for (all instances are able to start) or (any instance need stop)
• Remove heat check after exceed min heat temp