Util: New thread-unsafe version of ObjectCounter

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

...le/java/src/net/i2p/router/web/helpers/NetDbRenderer.java

...le/java/src/net/i2p/router/web/helpers/SybilRenderer.java

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

router/java/src/net/i2p/router/sybil/Analysis.java

...ava/src/net/i2p/router/tunnel/pool/TunnelPoolManager.java