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/GridNode.java

@@ -305,7 +305,7 @@ public class GridNode implements IGridNode, IPathItem
 			this.setGridStorage( WorldSettings.getInstance().getGridStorage( node.getLong( "g" ) ) );
 		}
 		else
-			throw new RuntimeException( "Loading data after part of a grid, this is invalid." );
+			throw new IllegalStateException( "Loading data after part of a grid, this is invalid." );
 	}
 
 	@Override