Do some packaging for easier maintenance

src/main/java/com/simibubi/create/content/optics/Beam.java

@@ -1,5 +1,11 @@
 package com.simibubi.create.content.optics;
 
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Set;
+
+import javax.annotation.Nullable;
+
 import com.mojang.blaze3d.matrix.MatrixStack;
 import com.simibubi.create.foundation.utility.VecHelper;
 
@@ -8,12 +14,6 @@ import net.minecraft.item.DyeColor;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.vector.Vector3d;
 
-import javax.annotation.Nullable;
-
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.Set;
-
 public class Beam extends ArrayList<BeamSegment> {
 	private final Set<ILightHandler> lightEventListeners;
 	@Nullable

src/main/java/com/simibubi/create/content/optics/behaviour/LightHandlingBehaviour.java

@@ -1,6 +1,19 @@
-package com.simibubi.create.content.optics;
+package com.simibubi.create.content.optics.behaviour;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Objects;
+import java.util.Set;
+import java.util.function.Predicate;
+import java.util.stream.Stream;
+
+import javax.annotation.Nullable;
 
 import com.google.common.collect.Iterators;
+import com.simibubi.create.content.optics.Beam;
+import com.simibubi.create.content.optics.ILightHandler;
+import com.simibubi.create.content.optics.ILightHandlerProvider;
 import com.simibubi.create.foundation.tileEntity.SmartTileEntity;
 import com.simibubi.create.foundation.tileEntity.TileEntityBehaviour;
 import com.simibubi.create.foundation.utility.BeaconHelper;
@@ -9,12 +22,6 @@ import com.simibubi.create.foundation.utility.VecHelper;
 import net.minecraft.tileentity.BeaconTileEntity;
 import net.minecraft.tileentity.TileEntity;
 
-import javax.annotation.Nullable;
-
-import java.util.*;
-import java.util.function.Predicate;
-import java.util.stream.Stream;
-
 public abstract class LightHandlingBehaviour<T extends SmartTileEntity & ILightHandlerProvider> extends TileEntityBehaviour implements ILightHandler {
 	protected final T handler;
 	public Set<Beam> beams;

src/main/java/com/simibubi/create/content/optics/behaviour/RotatedLightHandlingBehaviour.java

@@ -1,7 +1,7 @@
-package com.simibubi.create.content.optics;
+package com.simibubi.create.content.optics.behaviour;
 
 import com.simibubi.create.content.contraptions.base.KineticTileEntity;
-import com.simibubi.create.content.optics.mirror.RotationMode;
+import com.simibubi.create.content.optics.ILightHandlerProvider;
 import com.simibubi.create.foundation.utility.ServerSpeedProvider;
 
 import net.minecraft.nbt.CompoundNBT;

src/main/java/com/simibubi/create/content/optics/behaviour/RotationMode.java

@@ -1,4 +1,4 @@
-package com.simibubi.create.content.optics.mirror;
+package com.simibubi.create.content.optics.behaviour;
 
 import com.simibubi.create.foundation.gui.AllIcons;
 import com.simibubi.create.foundation.tileEntity.behaviour.scrollvalue.INamedIconOptions;

src/main/java/com/simibubi/create/content/optics/mirror/MirrorBehaviour.java

@@ -1,7 +1,11 @@
 package com.simibubi.create.content.optics.mirror;
 
+import java.util.stream.Stream;
+
+import javax.annotation.Nonnull;
+
 import com.simibubi.create.content.optics.Beam;
-import com.simibubi.create.content.optics.RotatedLightHandlingBehaviour;
+import com.simibubi.create.content.optics.behaviour.RotatedLightHandlingBehaviour;
 import com.simibubi.create.foundation.collision.Matrix3d;
 import com.simibubi.create.foundation.tileEntity.behaviour.BehaviourType;
 import com.simibubi.create.foundation.utility.AngleHelper;
@@ -10,10 +14,6 @@ import com.simibubi.create.foundation.utility.VecHelper;
 import net.minecraft.util.Direction;
 import net.minecraft.util.math.vector.Vector3d;
 
-import javax.annotation.Nonnull;
-
-import java.util.stream.Stream;
-
 public class MirrorBehaviour extends RotatedLightHandlingBehaviour<MirrorTileEntity> {
 	public static final BehaviourType<MirrorBehaviour> TYPE = new BehaviourType<>();
 

src/main/java/com/simibubi/create/content/optics/mirror/MirrorRenderer.java

@@ -28,7 +28,8 @@ public class MirrorRenderer extends KineticTileEntityRenderer {
 		MirrorTileEntity mirrorTe = (MirrorTileEntity) te;
 
 		renderMirror(mirrorTe, partialTicks, ms, buffer, light);
-		((MirrorTileEntity) te).getHandler().getRenderBeams()
+		((MirrorTileEntity) te).getHandler()
+				.getRenderBeams()
 				.forEachRemaining(beam -> beam.render(ms, buffer, partialTicks));
 	}
 
@@ -36,9 +37,11 @@ public class MirrorRenderer extends KineticTileEntityRenderer {
 
 		final Direction.Axis facing = te.getBlockState()
 				.get(BlockStateProperties.AXIS);
-		SuperByteBuffer superBuffer = AllBlockPartials.MIRROR_PLANE.renderOnDirectionalSouth(te.getBlockState(), te.getHandler().getBeamRotationAround());
+		SuperByteBuffer superBuffer = AllBlockPartials.MIRROR_PLANE.renderOnDirectionalSouth(te.getBlockState(), te.getHandler()
+				.getBeamRotationAround());
 
-		float interpolatedAngle = te.getHandler().getInterpolatedAngle(partialTicks - 1);
+		float interpolatedAngle = te.getHandler()
+				.getInterpolatedAngle(partialTicks - 1);
 		kineticRotationTransform(superBuffer, te, facing, (float) (interpolatedAngle / 180 * Math.PI), light);
 		superBuffer.renderInto(ms, buffer.getBuffer(RenderType.getTranslucent()));
 	}

src/main/java/com/simibubi/create/content/optics/mirror/MirrorTileEntity.java

@@ -5,6 +5,7 @@ import java.util.List;
 import com.simibubi.create.content.contraptions.base.KineticTileEntity;
 import com.simibubi.create.content.optics.ILightHandler;
 import com.simibubi.create.content.optics.ILightHandlerProvider;
+import com.simibubi.create.content.optics.behaviour.RotationMode;
 import com.simibubi.create.foundation.tileEntity.TileEntityBehaviour;
 import com.simibubi.create.foundation.tileEntity.behaviour.CenteredSideValueBoxTransform;
 import com.simibubi.create.foundation.tileEntity.behaviour.scrollvalue.ScrollOptionBehaviour;