Rename from PickSome to Deliberation

Created by: slifty

This PR changes the labels, filenames, and variable names to use "Deliberation" and "Choice" instead of "PickSome" and "Pick".

NOTE: this makes no attempt to migrate for past installations of the tool. Any site that is currently using the PickSome tool will need to manually:

1. Rename the PickSome database to "Deliberation".
2. Update the LocalSettings import to import Deliberation instead of PickSome.

Once this is merged the repository should also be renamed.

Related to #3 (closed)