Feature Request. Custom html tab templates

[JacoBezuidenhout]

Good day,

Thank you for the awesome plugin. It really works great.

One feature that can be really nice is to be able to link a tab to a custom html template.

Something like:

tabs = [
    ('Summary', "/admin/.../summary_tab.html"),
    ('Personal', tab_overview),
    ('Personal Docs', tab_personal_doc),
    ('Contact Details', tab_contact),
    ('Company Details', tab_company)
]