Replace all instances of icon fonts with SVG

[haustraliaer]

I've replaced all the references now with https://github.com/hivewallet/hive-js/commit/c54dde1c5352.

All that remains is to update the following in the actual master asset file (and then export to the img folder):

• [x] New spinner icon
• [x] add icon for money
• [x] change bg colour or border of success and error icons

Passing back to @jenbennings