First update pass (1/3) - ~1400 -> 82 errors

This is first update pass, which is mainly import reorganization, name
fixes, etc... Although some parts of second were done where changes
aren't important.
Errors: ~1400 -> 82.

src/main/java/appeng/integration/abstraction/IBuildCraftCore.java

@@ -24,7 +24,7 @@ import javax.annotation.Nullable;
 
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.Item;
-import net.minecraft.util.BlockPos;
+import net.minecraft.util.math.BlockPos;
 
 
 /**

src/main/java/appeng/integration/abstraction/INEI.java

@@ -19,7 +19,7 @@
 package appeng.integration.abstraction;
 
 
-import net.minecraft.client.renderer.entity.RenderItem;
+import net.minecraft.client.renderer.RenderItem;
 import net.minecraft.inventory.Slot;