* accounts/abi/bind/backends: add blockByHashNoLock

Signed-off-by: Oliver Tale-Yazdi <oliver@perun.network>

* accounts/abi/bind/backends: add 'parent' arg to rollback

Signed-off-by: Oliver Tale-Yazdi <oliver@perun.network>

* accounts/abi/bind/backends: add simulated forks

Signed-off-by: Oliver Tale-Yazdi <oliver@perun.network>

* accounts/abi/bind/backends: minor nitpicks

* accounts/abi/bind/backends: don't add defensive panics

Co-authored-by: Péter Szilágyi <peterke@gmail.com>