Disk usage dashboard widget

Fixed

• Fix PHP 7.2 compatibility issues

Added

• Add support for UNIX quotas

Fixed

• Fix an error if the directory to watch doesn't exist

Added

• Add the ability to customize the soft limit: once this amount of disk usage is reached the indicator will turn red (#1)

Fixed

• Fix disk usage indicator style

Changed

• Default monitored directory set to the Craft CMS base directory

Added

• Initial release