[IMP] account/sale/sale_layout: standardization of Quotation/Sale Order/Invoice printed layout + add missing information

- Column alignment and order are now uniform across those reports.
- Display Due date on invoices.
- Display payment term and fiscal positions notes.
[IMP] graph view on contacts
[FIX] sell future events only, not old ones
[WIP]website_popup: Create Module to displlay Popup for Newsletter Subscription

[IMP]improve code

[IMP]snippet for Banner Dialog To display Pop Up on mouse Leave

[IMP]add snippet options for the large,medium and small dialog

[WIP]Make Ediatble Dialog and on click link open dialog for the Edit.

[IMP]improve the dialog content and display it as dialog

[IMP]set the cookie management and improve the dialog

[IMP]code improvement and Not open Dialog on mouseleave if  edit mode

[IMP]website_popup: make snippet for popup on mouseleave of document and display popup for subscription and can change the content from newletter form view.

[IMP]remove unnused css

[IMP]improve the code

[IMP]improve the code for popup window

[IMP]improve the code

[IMP]improve code