[AndyB] Most reactions 1.5

Description:

Displays a Most reactions widget.

Features:

All phrases start with mostreactions_ for your convenience.

Creating the widget:

1. Admin Control Panel -> Appearance -> Widgets
2. Widget definition = Most reactions
3. Widget key = most_reactions
4. Title = (leave blank)
5. Display in positions = Forum list: Sidebar
6. Click Save.

User group permissions:

Normally you will select Yes to the following User groups:

Registered...

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Updated CSS to fix color issues when a dark style is being used.

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