Optimize spout recipe generation by avoiding filling non-empty items

[embeddedt]

Much of the time spent in Create's JEI plugin initialization is spent in SpoutCategory, where it iterates the entire list of JEI ingredients to generate filling recipes.

Most of the bottleneck is in getCapability as Forge fires an event for every single call (due to the item stacks being freshly constructed). The optimization here is to avoid the second getCapability call (that runs per registered fluid) by hoisting a check for whether the item could even be filled above the call. (We assume that a single-tank item cannot simultaneously be filled with two non-equal fluids.)

Another player and myself see a 7-10x improvement in the create:jei_plugin loading time with this change, tested on 1.20.1 with the following mods:

• GTCEu Modern
• NuclearCraft
• Mekanism
• Thermal
• Tinkers' Construct
• Create

An additional optimization would be to reduce the number of items being probed for capabilities, e.g. by iterating the item registry, instead of iterating the list of ingredients in JEI. I did not implement this as it would likely cause some edge case recipes to disappear.

[IThundxr]

Thanks!