In this state I was able to insert a new site. But only the mongodb datasource
seems to have receive the query (inserted in DB but not created on FS).

Deleted hardcoded Object class name + adding support for varchar & text
in editable_component template

Now using mass_deploy and slim seems to work for a monosite

forget to name the argument

Now when we try to update an object that do not exists a 404 is answered and not a 500 anymore

Now all "empty" values are deleted from the resulting array

Replace some old pure python import by LodelContext calls
Change the plugins imports methods to use LodelContext instead
Fixes dyncode exposure method

Implements a new exception class for webui : HttpErrors that uses a new template : errors.html to display multiples errors

- updated scripts etc
- make tests pass