add save and load to the wallet interface
add save and load to the wallet interface

ChrisSchinnerl/Sia,MrStrong/Sia,MrStrong/Sia,ChrisSchinnerl/Sia,rivine/rivine,mtlynch/Sia,ericflo/Sia,NebulousLabs/Sia,mnsl/Sia,johnathanhowell/Sia,kustomzone/Sia,mtlynch/Sia,mharkus/Sia,mnsl/Sia,mharkus/Sia,Mingling94/Sia,ericflo/Sia,rivine/rivine,cyrozap/Sia,NebulousLabs/Sia