Add-ons Snow Storm Effect 1.3.0

• UPDATE: light-weight snow to v0.0.4 for compatability with XF 2.3x, document.write() and defer
• ADD: link and create proper minified JS for production systems
• UPDATE: build.json for updated *.min.js using UglifyJs
• ADD: font-awesome 5 igloo icon to option group

• Fixed: Snow not working
• Added: Defer JavaScript
• Removed minified javascript for now because it seems to gimp the snow.js effect (not sure if it's a new chrome browser issue or not)

• Added: User preference setting
• Added: Ignore snow effects globally based on user preference
• User preference database setting on install/upgrade
• Removem preference on install