i2ptunnel: Add support for outproxy plugin to CONNECT proxy (tickets #1364, #1895)

...el/java/src/net/i2p/i2ptunnel/I2PTunnelConnectClient.java

...unnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPClient.java

...l/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPClientBase.java

...ptunnel/java/src/net/i2p/i2ptunnel/socks/SOCKSServer.java

...2ptunnel/java/src/net/i2p/i2ptunnel/ui/GeneralHelper.java

...i2ptunnel/java/src/net/i2p/i2ptunnel/ui/TunnelConfig.java

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/web/IndexBean.java