Util: Consolidate FileFilters

apps/i2psnark/java/src/org/klomp/snark/SnarkManager.java

...uterconsole/java/src/net/i2p/router/news/PersistNews.java

...terconsole/java/src/net/i2p/router/web/PluginStarter.java

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

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

...nsole/java/src/net/i2p/router/web/helpers/CertHelper.java

...e/java/src/net/i2p/router/web/helpers/FileDumpHelper.java

...usimail/src/src/i2p/susi/webmail/PersistentMailCache.java

core/java/src/net/i2p/crypto/CertUtil.java

core/java/src/net/i2p/util/FileSuffixFilter.java

.../net/i2p/router/networkdb/kademlia/BundleRouterInfos.java

...et/i2p/router/networkdb/kademlia/PersistentDataStore.java