[IMP] hr: job position: better state help + job positions are now open by default.
[IMP] purchase: added onboarding tip
[REM] project : Remove reviewer field
[IMP] crm: demo data update
[FIX] website.theme: need to convert xmlids into ids for write and reload theme
[FIX] website.theme: input are always checked for data with empty xmlid
[IMP] hr_timesheet, project: various usability-related improvements

hr_timesheet: merged use_timesheets and invoice_on_timesheets fields on account.analytic.account
that basically tells the same thing (project using timesheets). Propagated this change in
the various views using it.
project: various improvements in views to ease the user experience.
Merge pull request #2317 from odoo-dev/master-fix-theme-chm

[FIX] website.theme: need to convert xmlids; input are always checked
[IMP][website_mail] improved template designer, added support for background color, font color and bootstrap buttons(inline css) in mail designer + added new snippets + improved snippet categories
[IMP][wensite_mail] removed other snippet, changed snippet according to new format, moved first template in create new button, set marging feature enabled
[ADD][website_mail] added theme selector in mail_designer, lodeded snippets dynamically based on theme
[IMP][website_mail] improved theme handler, added help popover
[IMP] Added snippets for sunday theme
[IMP][website_mail] added remaining thumbnails
[IMP][website_mail] Added theme files
[IMP][website_mail] added snippet option to resize table colunn, added snippet option to resize image, removed duplicate snippet options
[IMP][website_mail] added bacground image support, solved some minor bugs

[IMP][website_mail] solved background issues

[IMP][website_mail] added social images, minor changes

[IMP][website_mail] improved inline width manager

This reverts commit acb6eba9c0880404630de159141fec3894172005.