Initial favorites system

Supports adding but not removing (once no longer active in pick pivot
tab). Favorites are not stored after application close. Styling and
animations to be done.
Select functionality for favorites

No actions yet for selected pools
Simplify pool message tokens
Unfavorite from favorites pivot tab

Also supports back button to cancel select mode. Needs refactor to
better meet MVVM principles.
Pool names start capital by default
Updated NuGet packages
Rethought pick view app bar buttons
Various changes

Have devised a new favorites UX, and so some of these changes will
likely be removed in up coming commits. Committed for reference. Note:
This commit is not necessarily stable!
Rework add favorite workflow

Very buggy at present. Rename via context, Instant roll toggle mode and
Update favorite remaining.
Rename favorite via context menu
Disable context menu zoom

This enables transitions to work. I will look into whether it's
possible/advisable for both at a later time.
Instant mode from favorites

Also save changes from pick view, when make customizations to a favorite
pool. Still very buggy!
Delete favorite from context menu
Fix favorite duplicate on save changes
Style adjustments
Back on main page always exits
Potential fix for intermittent startup exception

Visual element name conflicts; highly likely usage of 'Root' in pivot
tab views.
Potential fix for history view exception

Views using the MVVMLight Messenger class were being repeatedly bound on
construction, each time the hosting page was loaded.
Avoid repeated event bindings in main page
Include hint in rename text box