[Suggestion] Implement more vanilla-like falling block entity behavior

[geezmolycos]

It seemed that this mod replaced the vanilla onUpdate method with its own one, which is good most of the time, but it has some minor differences against vanilla one.

Some vanilla behaviors

• Falling block will not drop item if gamerule doEntityDrops is set to false or nbt tag DropItem is set to 0.
• Falling block will float instead of fall if nbt tag NoGravity is set to true

It is likely that some maps (probably some mods?) that use or spawn ghost blocks (falling blocks with NoGravity) will broken with this mod.
Modpack makers can be influenced with that.