[Integration branch] chalkit API

[abirEF]

related to issue #216

1. Separate in chalkit api in 2 packages (scheduler and dashboard)

For js script:

• chalkit.scheduler.[setVariable, setVariables, setVariableProperty, executeDataNode, executeDataNodes]
• chalkit.dashboard.[enableWidget, disableWidget, hideWidget, showWidget, wiewProject, viewPage, goToPage]
• keep root calls possible for old project (chalkit.x)

2. Remove blocking error when syntax error is found in chalkit api:

• update parser to avoid it for python script
• keep it without blocking execution for js script as commonly used with explicit trigger on, user receives the information without waiting execution

3. Update to take into account scheduling functionning n python script

[bengaid]

Thanks @abirEF and @TristanBartement , the chalkit API seems now wonderful !