As a user, I can write Cucumber PreConditions using autocomplete

As a user, I can write Cucumber PreConditions using autocomplete.

The suggested steps take into account "similar" steps from the existent steps in the scope of the current project. 

After the Cucumber PreCondition is saved, then all steps shall be persisted in the step library associated with the repository.

Note: the Gherkin reserved keywords shall not be persisted (e.g. Given, And, When, Then). This also means that they won't affect the autocomplete (they'll be ignored).