Describe the PR

• Remove most remaining usages of old properties (eg BooleanProperty, StringProperty) to use PropertyFactory. These are stuck on master because they're public.
• In some cases, when the properties were deprecated, remove them.
• Some of the old properties are still there, when they use a null default value. This is something the new property framework disallows explicitly. Such properties should be converted to use an Optional value, but the framework doesn't support that yet. We can update them when the framework is refactored.
• This also extracts something from the rule AvoidDuplicateLiterals: delimiter escaping in multi-valued properties. I don't think we need to completely remove delimiter logic, if anything, this enables backwards compatibility with the current framework. Keeping it also allows specifying some list values more concisely.

Related issues

#1432

Ready?

• Added unit tests for fixed bug/feature
• Passing all unit tests
• Complete build ./mvnw clean verify passes (checked automatically by travis)
• Added (in-code) documentation (if needed)