icon for metadata info panel

[toloudis]

We need a new icon for the new metadata info panel.

See #38 and #104

[frasercl]

Worth noting as well that we currently depend on some other icons from ant's library in production. Out of the full list here, we use in rough order of prominence: camera, setting, loading, step-backward, step-forward, down. Some of these are prominent enough to deserve a custom design (camera is used in the screenshot button and lives in the toolbar alongside custom icons), others may be fine as is (down is the arrow in dropdowns and fits just fine with the rest of the icons in the app).

Additionally, our current antd version (v3) is all-or-nothing on icon loading: if you need one icon, your app builds with all of them. This is less an argument for making more of our own icons than it is for addressing #42.

[thao-do]

Will attach final icons here after discussion to pick one. This screenshot includes the new metadata (3 variations) and camera icons.

[thao-do]

Here are the icons (camera, metadata)! Please let me know if you guys have any problems.

icons.zip

[toloudis]

@frasercl would you be able to drop these in and verify?

[frasercl]