Have proper block counters on an engine

[tiehuis]

We require a number of specific timers on each block for things such as gravity, lock delay and any other delay that is encountered. This needs to be decided whether or not to exist on an actual block instance (leaning against) or having another struct which is managed by the engine which manages these timers. This could also hold other timers unrelated to a block as well, such as ARE countdown etc.

[tiehuis]

This is closed with 87eeb56.

This uses a number of internal block timers and state that is not attached to the block itself.