ncd: modules: value: add value::substr()
ncd: modules: value: add value::substr()

atavism/badvpn,atavism/badvpn,adelshokhy112/badvpn,arevindh/badvpn,atavism/badvpn,walterDurin/badvpn,arevindh/badvpn,bawaaaaah/badvpn,bakhet/badvpn,Rastii/badvpn,nuwaf/badvpn,fffw/badvpn,walterDurin/badvpn,ambrop72/badvpn-googlecode-export,ambrop72/badvpn-googlecode-export,Qnex93/badvpn,nuwaf/badvpn,kaliii/badvpn,atavism/badvpn,ambrop72/badvpn-googlecode-export,henryhwang/badvpn,ambrop72/badvpn-googlecode-export,Qnex93/badvpn,bakhet/badvpn,henryhwang/badvpn,fragmede/badvpn,arevindh/badvpn,bawaaaaah/badvpn,walterDurin/badvpn,henryhwang/badvpn,arevindh/badvpn,adelshokhy112/badvpn,fragmede/badvpn,kaliii/badvpn,ambrop72/badvpn-googlecode-export,bakhet/badvpn,kaliii/badvpn,Rastii/badvpn,kaliii/badvpn,fffw/badvpn,walterDurin/badvpn,Qnex93/badvpn,nuwaf/badvpn,nuwaf/badvpn,Qnex93/badvpn,kaliii/badvpn,fragmede/badvpn,Rastii/badvpn,walterDurin/badvpn,atavism/badvpn,fragmede/badvpn,bakhet/badvpn,adelshokhy112/badvpn,adelshokhy112/badvpn,nuwaf/badvpn,bawaaaaah/badvpn,Rastii/badvpn,bawaaaaah/badvpn,Qnex93/badvpn,bakhet/badvpn,fffw/badvpn,fragmede/badvpn,arevindh/badvpn,henryhwang/badvpn,Rastii/badvpn,henryhwang/badvpn,bawaaaaah/badvpn,fffw/badvpn,fffw/badvpn,adelshokhy112/badvpn