[FIX] (website_)hr_recruitment: correct version of
659db669aae1ae58f2b416e3681b66269ed7521d
[IMP][website_mail] improved template designer, added support for background color, font color and bootstrap buttons(inline css) in mail designer,removed other snippet, changed snippet according to new format,added theme selector in mail_designer, lodeded snippets dynamically based on theme, added font-awesome support in mail snippets, added one controller which convert font-awesome to icon
[IMP] Fixed bug of dropzone,improved behavior of edit mode