eth_checkTransaction renamed to eth_checkRequest (#1817)

* Making ConfirmationsQueue a bit more generic [WiP]

* Generalizing cofirmations

* New confirmations types - tests

* Separating transaction type in queue. Closes #1310

* Handling sign requests

* Speeding up tests

* Renaming methods

* eth_postSign

* Bumping ui

* Renaming checkRequest methods, adding tests

* Removing duplicate method [ci skip]

* Remove `_posted`

[ci:skip]

* Remove `_posted`