Big work, look below

Merged EntityBoatContainer into EntityCustomBoat, generalized the wood
types and put them into a package object, overrode the onUpdate function
to allow greater control over the boat's behavior, added support for
custom speed (closes something, can't find the issue...) and crash
resistance(closes
https://github.com/Open-Code-Developers/BoatCraft/issues/193 ), made the
iron and gold materials more reissatant(needs balancing), and most
importantly, moved the Empy modifier from the "materials" folder to
"modifiers" :D