Console: Consolidate "checked" code

...ole/java/src/net/i2p/router/web/ConfigAdvancedHelper.java

...sole/java/src/net/i2p/router/web/ConfigClientsHelper.java

...rconsole/java/src/net/i2p/router/web/ConfigNetHelper.java

...nsole/java/src/net/i2p/router/web/ConfigReseedHelper.java

...erconsole/java/src/net/i2p/router/web/ConfigUIHelper.java

...nsole/java/src/net/i2p/router/web/ConfigUpdateHelper.java

...outerconsole/java/src/net/i2p/router/web/GraphHelper.java

...routerconsole/java/src/net/i2p/router/web/HelperBase.java

...routerconsole/java/src/net/i2p/router/web/HomeHelper.java