[+] unity plugin for charon
[-] remove IpSecVpnStateService.java
[~] move all needed functions from IpSecVpnStateService to IpSecTunnel
[~] VpnTunnel now contains connection and error statuses
[~] VpnManagerService can be notified about tunnel state change for now
[+] jni code for usernat
[~] OpenVpnTunnel and OpenVpnWorker use generic connection statuses for now
[~] beautifying code
[+] usernat tunnel implementation (mostly copied fro openvpn tunnel)
[+] usernat binary is able to use management socket for now
[~] improve debugging facilities in MiscUtils