Add fluidbuilder binding

[jurrejelle]

What

Re-adds the missing fluid builder

Implementation Details

Materials with a builder NEED to be registered to the gtceu: namespace, or they will get a

    Exception message: java.lang.IllegalStateException: Some intrusive holders were not registered: [Reference{null=[unregistered]}] 
    
    ```
    StartupEvents.registry('gtceu:material', event => {
event.create('gtceu:soul_stained_alumina')
    .color(0xdb3dff).secondaryColor(0xe683fc)
    .ingot()
// THIS material is broken, in the context the fluidbuilder is now dead...
event.create('gtceu:source_oils')
    .liquid(new GTFluidBuilder().state(GTFluidState.LIQUID).customStill())
    .color(0xe642f5)

})

[Reabstraction]

Looks good to me