Move to material-icons

[MultiMote]

Migrated from FontAwesome icons to Material Design Icons font. Visual look is slightly changed.

Pros:

• Bundle size decreased a lot (from 1.73MB to 963 kB).
• MDI library has lot of icons.
• No more "Loading resources" screen.
• There is no more SVG icons on the page (icon picker was cluttering up the page very badly). Only unicode characters. Icon picker is now faster.
• When you insert an icon to label, it inserted as a single character, not as SVG image.

Cons:

• When you insert an icon, selection bounding box is misaligned
• There is some alignment issues