Downloader instances list

[ddelpiano]

Changes requested:

• we'll have a global type list with checkboxes (as it is now, so nothing much to do here).

• Add list of instances with checkboxes to select a single instance

• add checkbox all instances to select/deselect all.

• In term of functionality the lists are static in the sense that the user can select all the types and all the instances but the model does not guarantee that a certain instance has all the type.

• The instances list will have to show all the instances presents in the scene, same list we have for the list viewer/control panel component.

the layout will be similar to

• type 1
• type 2
• type 3
• type 4
• type 5

---

• all instances
  • Instance 1
  • Instance 2
  • Instance 3
  • Instance 4

[jrmartin]

@ddelpiano Implemented this one, needs CSS styling :