Smile web hide groups

Add options on group in xml to manage to show/hide fields inside group

How to use:

• Default use (all fields inside groups is hidden):

<group string="Test" options="{'active_show_hide': True}">

• Add option default_show to active widget & show fields inside group by default

<group string="Test" options="{'active_show_hide': True, 'default_show': True}">