Make grs setFormula method behave in the same way as ceu ones

[MCTian-mi]

What

Make the setFormula method expansion from grs behave in the same way as ceu's. (i.e. returns the material instance instead of void return.

Implementation Details

Simply changes method returns to the material instead of nothing.

Outcome

In be4 this kind of code works in java but not in a grs script (since it considers groovy mixin'd methods first):

LEU235UraniumDioxide = new Material.Builder(8661, SuSyUtility.susyId('leu_235_uranium_dioxide'))
                .dust()
                .iconSet(SAND)
                .components(LEU235, Oxygen * 2)
                .color(0x1d2618)
                .build()
                .setFormula("UO2", true) // This retuens the material in Java, but null in grs

instead one needs to use:

LEU235UraniumDioxide = new Material.Builder(8661, SuSyUtility.susyId('leu_235_uranium_dioxide'))
                .dust()
                .iconSet(SAND)
                .components(LEU235, Oxygen * 2)
                .color(0x1d2618)
                .build()

LEU235UraniumDioxide.setFormula("UO2", true)

This PR makes the former form of code possible via grs.

Potential Compatibility Issues

None that I could think of?

[brachy84]

Im wondering why these exist at all when they just delegate to gt

[bruberu]

Since there is probably plenty of time before this would actually go in-game, there are a couple other methods that could be added to this PR, such as setIconSet, setHarvestLevel, setBurnTime, addToolEnchantment, addScaledToolEnchantment, setToolStats (all), setOverrideToolStats, and setBlastTemp.

[bruberu]

OK, I've done precisely that.