core: allow templates to access all course data

[oliverfoster]

• add {{import_adapt}} helper
  add this once to the top of the template or the beginning of the json string
• allow {{Adapt.config.propertyName}}
• allow {{Adapt.course.propertyName}}
• allow {{Adapt.contentObjects.[id].propertyName}}
• allow {{Adapt.articles.[id].propertyName}}
• allow {{Adapt.blocks.[id].propertyName}}
• allow {{Adapt.components.[id].propertyName}}

Example

{{import_adapt}} {{{Adapt.course.displayTitle}}} {{{Adapt.components.[c-05].displayText}}}