Upgrade chain select templates

Chain select widget types (mono and multi) are using templates defined on Studio side, and they are outdated.
What should be done:

• expose more options (allowBranchSelection / allowRootSelection)
• use widgetProperty_propName to ensure good resolution of properties defined with EL expressions

For recent nuxeo version, they should be replaced by a new widget type (once new selection widget types are available, see NXP-4935)