… a xcconfig file.

This allows a developer to specify DEVELOPMENT_TEAM_OVERRIDE - If they do so the specified DEVELOPMENT_TEAM_OVERRIDE will be used as the DEVELOPMENT_TEAM in all the places it needs to be.
If it's not set - then it defaults to B6QG723P8Z

…RODUCT_BUNDLE_IDENTIFIER - to make it easier to get running on a different Apple Developer account.

…LE_IDENTIFIER to PRODUCT_BUNDLE_IDENTIFIER_BASE - otherwise the Autofill targets had the wrong iCloud settings due to the expanded PRODUCT_BUNDLE_IDENTIFIER (+1 squashed commit)

Squashed commits:
[8464e48] Setup the iCloud Containers/Ubquity container IDs to be based off of the PRODUCT_BUNDLE_IDENTIFIER

…ld target runs the GenerateBuildConfig.sh to autogenerate a Swift file that exposes compile time values for the APPGROUP amongst others

…tializer that sets the correct service/access group.

Use the new OpenSesameKeychain to consolidate the usage of the service/app groups in one spot.
Replace further hardcoded CloudKit container identifiers and NSUserDefault suite names to use the values from OpenSesameConfig
Expose the DEVELOPMENT_TEAM as part of the OpenSesameConfig

…tifier base is set.