Problem: missing update for wc 2.0 api (fix #326) (#329)

compiles

initialize wallet

fix ensure session

remove setup callback

polling ok

polling works

fix dead-lock

check flag before begin polling

if core already exists, exit

fix polling

default callback

remove debugging log

remove log

polling events on/off

refactor

remove un-necessary code

temp fix for wc 2.0

tidy up

add return

can change ensure session timeout

add flag for eip155 workaround

replace const with member variable

Author: leejw51crypto