Improved exceptions

Many exceptions got an improvement due to changed class or description or details it is providing.
Is not complete, needs to be done in patches in the regions, where it is needed, since some are just
swallowed.

Removed total usage of pure RuntimeExceptions to 0.

src/main/java/appeng/me/cluster/implementations/CraftingCPUCluster.java

@@ -934,7 +934,7 @@ public class CraftingCPUCluster implements IAECluster, ICraftingCPU
 
 	public IAEItemStack getItemStack( IAEItemStack what, CraftingItemList storage2 )
 	{
-		IAEItemStack is = null;
+		IAEItemStack is;
 		switch( storage2 )
 		{
 			case STORAGE:
@@ -960,7 +960,7 @@ public class CraftingCPUCluster implements IAECluster, ICraftingCPU
 				break;
 			default:
 			case ALL:
-				throw new RuntimeException( "Invalid Operation" );
+				throw new IllegalStateException( "Invalid Operation" );
 		}
 
 		if( is != null )