Add New Icon Pack to Theme

[Jeremy Hopkins]

We need to add the new icon pack to the theme by creating the directory structure required and adding each image into that folder to override core Moodle icons.

If any are missing we need to ask Liz to create these also.

[Manoj Solanki]

Fix #665. Initially added new icon pack. Note that icon not added for the following mods: imscp and resource (could not find equivalent in icons provided)

→ <<cset 85c90f09b817>>

[Manoj Solanki]

Further commit to check in file type icons and related change in renderers.php here:

https://bitbucket.org/covuni/moodle-theme_adaptable/commits/3f9830c805c9ed8b00c5563520f2f03d43197bb8

[Manoj Solanki]

Add file type icons for navigation block as per email discussion.