Feature expression evaluator

[cturbelin]

Survey inspector feature

• Add a right panel with survey inspector (see below), the panel can be toggled
• Add input checkbox to toggle keys
• Remove menu in survey simulator (to simplify the navigation)
• Add "Language" label to language menu (to help end users)

Survey Inspector is composed of 3 tabs

• Response to see current response (can filter by item key), view as JSON or as card
• Expression : list all expressions in the survey (completeness to be checked) and show the value of its evaluation using the current state of the survey. When the evaluated value change from the last survey state, the expression box show orange background. It's possible to filter expression by item key.
• Custom : Can set an custom expression and evaluate it using the current survey state (more complex expression editor is in progress) for instance the json.

It depends on a modification of case-web-ui, passing the survey engine instance in the response callback.