Favicon tester

[PhantomWatson]

All sites should fully pass the favicon compatibility tester at https://realfavicongenerator.net/favicon_checker

For CakePHP 3 Data Center sites,

this can be accomplished by

1. Updating /src/Console/Installer.php to match the latest version in the Data Center skeleton app
2. Running composer update ballstatecber/datacenter-plugin-cakephp3
3. (Presumably automatically) copying favicon asset files into the site's /webroot directory

For CakePHP 2 Data Center sites,

we'll need to update the CakePHP 2 Data Center plugin's default layout file and manually copy asset files into various /webroot directories.

For other sites,

their favicons can be run through https://realfavicongenerator.net to generate alternate versions and be updated accordingly.