Quicklook plugin support.
Added qlplugin cask for BetterZipQL.
Added qlplugin cask for jsonlook.
Added qlplugin cask for QLColorCode.
Added qlplugin cask for QLMarkdown.
Added qlplugin cask for QLStephen.
Added qlplugin cask for ScriptQL.
Added qlplugin cask for Suspicious Package.