Add asset icons to the Market and Exchange

**Is your feature request related to a problem? Please describe.**
The current method of listing market assets in the Exchange may or may not be an improvement compared to previous releases. It can be confusing, lead to mistakes, missed trades, or dissuade a user from trading at all, especially with so many new assets being added.
Please see the rough mock up below.

**Describe the solution you'd like**
Consider adding the asset icon to both the Market listings and the buy/sell orders for a better user experience, and less customer support issues. Placing the icon in the buy/sell orders helps direct the user towards their goal, and visually confirms their intentions.

I placed three icons on both the buy and sell sides, which may or may not be excessive but I think it helps provide affirmation to the user that they are in their intended market. Probably the most helpful being placed in the buy/sell fields as shown which clearly shows the gain or loss by clicking buy or sell (maybe both icon pairs should be present, but I think just the one removes any doubt).

**Describe alternatives you've considered**
 Current 2.0.181212-rc5

**Additional context**
 mock up I made to illustrate my point

Start by locating the Market and Exchange listing and buy/sell order entry points in the UI, then compare their current presentation with the linked screenshots. Clarify which asset icon placements are required, and consider the work complete when the agreed icons consistently identify the intended assets in both areas.

Written by the indexing model from the issue text.