util: Use std::chrono for time getters
util: Use std::chrono for time getters

achow101/bitcoin,qtumproject/qtum,yenliangl/bitcoin,bitcoinknots/bitcoin,GroestlCoin/GroestlCoin,namecoin/namecoin-core,fanquake/bitcoin,domob1812/namecore,yenliangl/bitcoin,sstone/bitcoin,MarcoFalke/bitcoin,jambolo/bitcoin,sipsorcery/bitcoin,pataquets/namecoin-core,pataquets/namecoin-core,GroestlCoin/bitcoin,particl/particl-core,ElementsProject/elements,domob1812/bitcoin,sipsorcery/bitcoin,jlopp/statoshi,tecnovert/particl-core,MeshCollider/bitcoin,mm-s/bitcoin,tecnovert/particl-core,mm-s/bitcoin,andreaskern/bitcoin,mm-s/bitcoin,particl/particl-core,domob1812/namecore,bitcoinknots/bitcoin,rnicoll/bitcoin,domob1812/namecore,particl/particl-core,achow101/bitcoin,sstone/bitcoin,GroestlCoin/GroestlCoin,sstone/bitcoin,GroestlCoin/bitcoin,rnicoll/bitcoin,MeshCollider/bitcoin,namecoin/namecoin-core,ElementsProject/elements,fanquake/bitcoin,lateminer/bitcoin,jambolo/bitcoin,mruddy/bitcoin,andreaskern/bitcoin,namecoin/namecoin-core,prusnak/bitcoin,domob1812/namecore,qtumproject/qtum,yenliangl/bitcoin,prusnak/bitcoin,dscotese/bitcoin,anditto/bitcoin,ElementsProject/elements,kallewoof/bitcoin,JeremyRubin/bitcoin,Sjors/bitcoin,anditto/bitcoin,MarcoFalke/bitcoin,jamesob/bitcoin,particl/particl-core,anditto/bitcoin,bitcoin/bitcoin,lateminer/bitcoin,instagibbs/bitcoin,pataquets/namecoin-core,jambolo/bitcoin,prusnak/bitcoin,domob1812/namecore,AkioNak/bitcoin,prusnak/bitcoin,sstone/bitcoin,Xekyo/bitcoin,bitcoin/bitcoin,mruddy/bitcoin,bitcoinsSG/bitcoin,Xekyo/bitcoin,ajtowns/bitcoin,sipsorcery/bitcoin,dscotese/bitcoin,Sjors/bitcoin,JeremyRubin/bitcoin,MeshCollider/bitcoin,Xekyo/bitcoin,n1bor/bitcoin,sipsorcery/bitcoin,AkioNak/bitcoin,prusnak/bitcoin,namecoin/namecoin-core,n1bor/bitcoin,jlopp/statoshi,mruddy/bitcoin,kallewoof/bitcoin,yenliangl/bitcoin,sipsorcery/bitcoin,Xekyo/bitcoin,lateminer/bitcoin,kallewoof/bitcoin,jamesob/bitcoin,ajtowns/bitcoin,JeremyRubin/bitcoin,anditto/bitcoin,qtumproject/qtum,mm-s/bitcoin,n1bor/bitcoin,tecnovert/particl-core,MeshCollider/bitcoin,yenliangl/bitcoin,jlopp/statoshi,ajtowns/bitcoin,prusnak/bitcoin,bitcoinknots/bitcoin,domob1812/bitcoin,jamesob/bitcoin,dscotese/bitcoin,AkioNak/bitcoin,kallewoof/bitcoin,GroestlCoin/bitcoin,rnicoll/bitcoin,rnicoll/bitcoin,fujicoin/fujicoin,fanquake/bitcoin,instagibbs/bitcoin,mm-s/bitcoin,AkioNak/bitcoin,domob1812/bitcoin,namecoin/namecore,kallewoof/bitcoin,Sjors/bitcoin,lateminer/bitcoin,achow101/bitcoin,sstone/bitcoin,tecnovert/particl-core,lateminer/bitcoin,jambolo/bitcoin,achow101/bitcoin,pataquets/namecoin-core,namecoin/namecoin-core,instagibbs/bitcoin,AkioNak/bitcoin,apoelstra/bitcoin,rnicoll/bitcoin,jlopp/statoshi,apoelstra/bitcoin,andreaskern/bitcoin,mruddy/bitcoin,anditto/bitcoin,instagibbs/bitcoin,sstone/bitcoin,mruddy/bitcoin,namecoin/namecore,namecoin/namecore,jamesob/bitcoin,Xekyo/bitcoin,domob1812/namecore,ElementsProject/elements,bitcoinsSG/bitcoin,fujicoin/fujicoin,tecnovert/particl-core,fanquake/bitcoin,domob1812/bitcoin,qtumproject/qtum,achow101/bitcoin,GroestlCoin/bitcoin,MeshCollider/bitcoin,GroestlCoin/bitcoin,apoelstra/bitcoin,fujicoin/fujicoin,namecoin/namecore,andreaskern/bitcoin,ElementsProject/elements,domob1812/bitcoin,ajtowns/bitcoin,jlopp/statoshi,bitcoin/bitcoin,JeremyRubin/bitcoin,pataquets/namecoin-core,achow101/bitcoin,dscotese/bitcoin,yenliangl/bitcoin,Sjors/bitcoin,dscotese/bitcoin,bitcoinknots/bitcoin,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,instagibbs/bitcoin,bitcoinsSG/bitcoin,jamesob/bitcoin,jambolo/bitcoin,qtumproject/qtum,namecoin/namecore,apoelstra/bitcoin,qtumproject/qtum,fanquake/bitcoin,sipsorcery/bitcoin,GroestlCoin/GroestlCoin,fujicoin/fujicoin,fujicoin/fujicoin,fanquake/bitcoin,jambolo/bitcoin,GroestlCoin/bitcoin,kallewoof/bitcoin,n1bor/bitcoin,GroestlCoin/GroestlCoin,jamesob/bitcoin,GroestlCoin/GroestlCoin,bitcoinsSG/bitcoin,particl/particl-core,ajtowns/bitcoin,lateminer/bitcoin,rnicoll/bitcoin,bitcoin/bitcoin,namecoin/namecore,ElementsProject/elements,tecnovert/particl-core,fujicoin/fujicoin,MarcoFalke/bitcoin,mm-s/bitcoin,namecoin/namecoin-core,Xekyo/bitcoin,andreaskern/bitcoin,pataquets/namecoin-core,dscotese/bitcoin,qtumproject/qtum,bitcoin/bitcoin,MarcoFalke/bitcoin,AkioNak/bitcoin,bitcoinsSG/bitcoin,JeremyRubin/bitcoin,andreaskern/bitcoin,n1bor/bitcoin,apoelstra/bitcoin,domob1812/bitcoin,JeremyRubin/bitcoin,jlopp/statoshi,instagibbs/bitcoin,bitcoin/bitcoin,n1bor/bitcoin,Sjors/bitcoin,apoelstra/bitcoin,ajtowns/bitcoin,particl/particl-core,anditto/bitcoin,bitcoinknots/bitcoin,bitcoinsSG/bitcoin,MeshCollider/bitcoin,MarcoFalke/bitcoin,mruddy/bitcoin