Give Cecily a readme
Move the Cecily icon
Better icon for the core plugin
Generic fallback icons for plugins
Improve plugin tab layout

It’s still a bit of a mess, and the vertical alignment isn’t working
properly
Remove support for underscore and dash in wikilinks

Starting to fix #337
Stop classifying "×" (\u00d7) as a lower case letter

Part of #337
Stop classifyinh "÷" (\u00f7) as an upper case letter

Part of #337
Disable wikilinking when preceded with dash or underscore

“HelloThere” in “My-HelloThere” shouldn’t be wikified.

Part of #337
Improved formatting for control panel plugins
Readme update
Docs update
Minor icon tweaks
Docs update
More improvements to control panel plugin formatting
Merge remote-tracking branch 'upstream/master'
More formatting improvements for plugins control panel
Docs updates
Add icon previews to tag manager
Merge remote-tracking branch 'upstream/master'