Merge pull request #730 from Emurgo/v_almonacid/ch2177/add-balance-check-flow
initial balance check flow
Even though this PR contains unfinished work, it was only meant to be a first quick iteration of the UI. Next PR addresses most of the issues.
add TransferSummaryScreen and fixes routing problem
the routing structure is slightly modified to add a temporary TransferSummaryScreen for showing balance check in Shelley. The changes in the routing structure also fixes the bug observed when switching wallets