[Assignments] Add a Google Drive Button

[TMilich]

Problem statement:

For you to add a "Google Drive" button that is solely for Google Drive when students need to use something out of their Google Drives. The "more" option is over looked by students. Students tend to try to post a URL thus not getting something submitted properly from their Google Drives.

Proposed solution:

Add a "Google Drive" button along with "Text", "Studio", "URL", etc. options.

User role(s):

student