Changed FlowableFluid getVelocity method name to getFlowDirectionVect…

[Levoment]

Changed FlowableFluid getVelocity method name to getFlowDirectionVector. Changed the argument in the same method with name state to mainFluidState. Also added a documentation for the method. This method tells the game the direction a fluid should flow by evaluating the level of other fluid blocks around it. It returns a 3D vector with numbers -1 OR 0 OR 1 for each component of the 3D vector to indicate what direction the fluid should flow towards.

I thought about using just getFlowDirection, but given that Direction is already a class that indicates something else, I went with getFlowDirectionVector to indicate in the name it returns a vector and not a Direction object. It is still a vector that is used to know the direction of flow from a fluid, but it's not a Direction object.

state I changed to mainFluidState to make it more clear in the code from the method that the variable holds the FluidState whose direction is desired since the method creates 2 other FluidState objects inside of it to make the calculations of flow direction.

[Levoment]

I just committed the suggestions.

[Juuxel]

It returns a 3D vector with numbers -1 OR 0 OR 1 for each component of the 3D vector to indicate what direction the fluid should flow towards.

This might be good to include in the javadoc

[github-actions[bot]]

🚀 Target branch has been updated to 22w42a