Update hints to work with new question

Summary:
For https://trello.com/c/Tcuhzsoh/698-decimals-on-the-number-line-3
Add exercise type with hundredths
Add questions with vertical numberlines

Test Plan: Try all the exercise types and their hints.

Reviewers: emily, eater

Reviewed By: eater

Differential Revision: https://phabricator.khanacademy.org/D15078