Create Multiple Sling CMS Instance Types

Currently, there is only a single build of Sling CMS which is easier, but the build also contains dependencies and code which would not be required in a read-only instance. The idea here would be to:

• separate out the authoring-specific features from the base CMS features
• remove all non-required dependencies (e.g. Tika Bundle, etc)
• potentially tweak the configuration for security
• create an instance type for standalone vs. author
• implement builders for each type of instance

The goal is to build a smaller distribution specifically for creating read-only instances and then distributions for standalone and author instances.