small refactoring about contract state

[rabbitprincess]

What is changed?

OpenContractStateAccount(XXX) to GetXXXAccountState()

Is there risk of fork?

not at all.

[kroggen]

Avoid renaming the title or editing the first message because these both trigger a new full test

The trigger should happen only when the base branch is changed, but unhappily it also occurs for the cases above