Added content density enum
Added content density into UiSettings class
Added base image property classes
Changed extension of text property from model to property
Added image property into view enum and updated UiSettings to add ImageProperty into view processor map
Added image list item model
Added image list item holder and view
Added image list item into view enum
Merge branch 'feature/image-list-item' into feature/views

* feature/image-list-item:
  Added image list item into view enum
  Added image list item holder and view
  Added image list item model
  Added image property into view enum and updated UiSettings to add ImageProperty into view processor map
  Changed extension of text property from model to property
  Added base image property classes
  Added content density into UiSettings class
  Added content density enum
Created title list item model
Created holder and view
Added title list item into view enum
Merge branch 'feature/title-list-item' into feature/views

* feature/title-list-item:
  Added title list item into view enum
  Created holder and view
  Created title list item model
Create list item model for description
Created holder and view
Added description list item in view enum
Tidied up description view layout
Added holder population
Merge branch 'feature/description-list-item' into feature/views

* feature/description-list-item:
  Added holder population
  Tidied up description view layout
  Added description list item in view enum
  Created holder and view
  Create list item model for description
Added standard list item model