Allow addition of user-controllable help text on Project Settings screen

Technical approach:

• Create setting volunteer_general_project_settings_help_text
• Update settings form at /civicrm/admin/volunteer/settings
• Update VolunteerUtil.getsupportingdata API
• Update Angular form/tpl

The new setting will accept HTML input via WYSIWYG and output it above the form on /civicrm/vol/#/volunteer/manage/0.

Seeking input on the default help text for this page; for reference, the client funding this work is going to use this:

Projects are groups of volunteer activities that will accomplish a specific goal.

For example – you have volunteers engaging in SNAP or Summer Meals outreach on multiple days and times or you are throwing a fundraiser for a Hunger Organization and need volunteers to help set up, greet people, and clean up. The event is the project, which then has several unique opportunities for volunteers to participate.

Projects can be a single event, a series of events/opportunities, or an ongoing opportunity at your organization.

First, let's name your project! In the fields below, provide a description that gives volunteers the big picture. Then, identify where volunteers will show up when volunteering for this project.