Updates definitions for schedule and package rules to allow strings to be massaged to lists - instead of erroring.

Closes #662

Now no need to detect at onboarding time. Also suggests removing setting in migration if it is already the same value.

Closes #528

No need for {{semanticPrefix}} to be specified in templates now - it will be implicitly added to start of commit message and PR titles if semanticCommits=true

Closes #226 

- Renames `packages` to `packageRules`
- Refactor `packageName` to `packageNames` array
- Refactor `packagePattern` to `packagePatterns` array
- Adds `excludePackageNames` array
- Adds `excludePackagePatterns` array

Closes #529

Massaging of string to array is done in migration function.

depTypes configuration is now refactored from being an array of strings/objects to having each type of dep (`dependencies`, `devDependencies`, `optionalDependencies`, `peerDependencies`) be a first class object in the namespace. The "old" way of configuring is still supported but is transformed using a migrateConfig script. Later, PRs will be raised to impacted repositories to suggest the new config.