New Objects + Layers Dialog: Take 2

In inkscape!2466 (merged), the new objects dialog was merged. This master issue collects further improvement of the new dialog, including the Layers dialog functionality.

proposed improvements:

• clicking on a non-layer group should not auto expand it's contents in the same way as a layer group.
• add hover indication for row
• selecting on canvas does not scroll in dialog
• deleting objects does not work when node tool is selected
• selecting multiple objects and clicking on hide/ lock lock just one object
• you are unable enter or exit group inside layers dialog
• selecting with shift brakes selection
• click and drag on icons (lock,eye) to turn off/ on many object quickly
• search feature (sort of)
• advanced filtering
• missing commands from layers (needs design )