Add some tweaks to improve transformation time #16
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Add some additional checks so the classwriter is not used if possible, as classwriting with computing frames can take some time, and avoiding creating a new arraylist if no transformers are present.
Nearly cuts the time spend on transforming classes in half with some changes to forge to return a null ClassNode when nothing is transformed (About 1.5 seconds total to 2.8 spend on ClassTransformer#transform).