Better UX in Credits Screen

Currently, in order to add contributors to the Credits Screen, the code within the Credits screen needs to be updated. This is not optimal, should we get lots of contributors to the project.
It would be better if the contributor list was moved to an xml file, possibly with the following format

```

A
http blah blah
Helped Fix....

```

Then, when the Credits Page is launched...
- [ ] It reads the aforementioned XML file.
- [ ] Dynamically creates the MenuItems and EventHooks (when selected it launches the associated URI)
- [ ] Displays a maximum of X contributors on screen and allows navigation, up or down to the remaining contributors in the list.

Start by locating the Credits Screen implementation and its current contributor list. Review how screen controls, navigation, and URI launches are handled before choosing the XML loading approach. Done means contributors come from XML, entries create selectable menu items with URI actions, and the list supports the stated on-screen limit and navigation.

Written by the indexing model from the issue text.