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/util/ConfigManager.java

@@ -62,7 +62,7 @@ public final class ConfigManager implements IConfigManager
 		if( oldValue != null )
 			return oldValue;
 
-		throw new RuntimeException( "Invalid Config setting" );
+		throw new IllegalStateException( "Invalid Config setting. Expected a non-null value for " + settingName );
 	}
 
 	@Override