Comment 5 for bug 1681579

Reviewed: https://reviews.mahara.org/7660
Committed: https://git.mahara.org/mahara/mahara/commit/d5e858982cfd0148cbbda3e7c69ed567e964127b
Submitter: Robert Lyon (<email address hidden>)
Branch: 17.04_STABLE

commit d5e858982cfd0148cbbda3e7c69ed567e964127b
Author: Pat Kira <email address hidden>
Date: Tue Apr 11 13:42:33 2017 +1200

Bug 1681579 - Added svg support for mahara logo

- Make svg of supported extension.
- Add svg versions of Mahara logo to all core themes including footer
logo.
- Tidied up upgrade footer styles and templates as well as using
theme_image_url instead of image path with specific file extension.

Note 1: We are not removing exisiting png version of both logos just
in case someone needs it or want to use it.

Fixed configurable custom logo display
- Check if there is a custom logo if so add to data attribute on the
template.
- Add a check in js if there's custom logo we won't replace the logo

Note 2: Displaying correct version of Mahara logo based on header
background could be done at the backend (PHP) since the background value
stored in the database (I think).

behatnotneeded

Change-Id: I377401a9477e3b06e9fcee366579bbfc09bc73ea
(cherry picked from commit 4078c8d5c52bbfd7e021b1b54b2db1d1361dc391)