Spark sql inputs

* some versions upsteps (jquery, ui, bootsrap, unflitered, etc)
* some refact in the widget and dataconnector
* introduced widget `out` which is reactive and can print stuffs in html
* SQL can now includes specific token to ask for a form input, like `{String: myVarName}` or `{Long: myLong}`
* Sql type has a `react` functions that allows a reactive update of the visualization of a sql response

Issues introduced:
* glitches in ribbon → need to click on `file` for the moment to recover a well-sized ribbon
* icons in the snippets blocks are gone (→ bootstrap icons are misplaced)