add fee estimation to 'siac wallet'
add fee estimation to 'siac wallet'

NebulousLabs/Sia,NebulousLabs/Sia,MrStrong/Sia,mharkus/Sia,mtlynch/Sia,MrStrong/Sia,ericflo/Sia,ChrisSchinnerl/Sia,ChrisSchinnerl/Sia,ericflo/Sia,mharkus/Sia,mtlynch/Sia