[views] new cubicweb logo (closes #3803681) - add the new CubicWeb logo - use it as a css (background-image) - change the color of the header bar (gradient made with css)

sync_schema_props_perms(('State', 'state_of', 'Workflow'), commit=False)
sync_schema_props_perms(('State', 'name', 'String'))