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/items/parts/ItemMultiPart.java

@@ -79,7 +79,7 @@ public class ItemMultiPart extends AEBaseItem implements IPartItem, IItemGroup
 		for( PartTypeIst p : this.dmgToPart.values() )
 		{
 			if( p.part == mat && p.variant == varID )
-				throw new RuntimeException( "Cannot create the same material twice..." );
+				throw new IllegalStateException( "Cannot create the same material twice..." );
 		}
 
 		boolean enabled = true;
@@ -102,7 +102,7 @@ public class ItemMultiPart extends AEBaseItem implements IPartItem, IItemGroup
 			}
 			else
 			{
-				throw new RuntimeException( "Meta Overlap detected." );
+				throw new IllegalStateException( "Meta Overlap detected." );
 			}
 		}
 
@@ -130,7 +130,7 @@ public class ItemMultiPart extends AEBaseItem implements IPartItem, IItemGroup
 		for( PartTypeIst p : this.dmgToPart.values() )
 		{
 			if( p.part == mat && p.variant == varID )
-				throw new RuntimeException( "Cannot create the same material twice..." );
+				throw new IllegalStateException( "Cannot create the same material twice..." );
 		}
 
 		boolean enabled = true;
@@ -152,7 +152,7 @@ public class ItemMultiPart extends AEBaseItem implements IPartItem, IItemGroup
 				return output;
 			}
 			else
-				throw new RuntimeException( "Meta Overlap detected." );
+				throw new IllegalStateException( "Meta Overlap detected." );
 		}
 
 		return null;
@@ -275,8 +275,9 @@ public class ItemMultiPart extends AEBaseItem implements IPartItem, IItemGroup
 		}
 		catch( Throwable e )
 		{
-			throw new RuntimeException( "Unable to construct IBusPart from IBusItem : " + this.getTypeByStack( is ).getPart().getName() + " ; Possibly didn't have correct constructor( ItemStack )", e );
+			throw new IllegalStateException( "Unable to construct IBusPart from IBusItem : " + this.getTypeByStack( is ).getPart().getName() + " ; Possibly didn't have correct constructor( ItemStack )", e );
 		}
+
 		return null;
 	}