Spotlight prediction market

General

Closes UI part of #120

Implemented all stated UI for tables with prediction markets overview and market details (opinions related to market). Implemented fetching of markets and opinions from blockchain. Implemented modals for PM creation, Opinion adding, PM resolution. Implemented filter features for markets and opinions tables.

Left to do / clarify:

[ ] Use action to create prediction market
[ ] Use action to buy/sell PM assets (submit opinion)
[ ] Use action to resolve PM
[ ] Use action to cancel owned opinions
[ ] Fix unstable issues with opinions fetching from MarketsStore
[ ] Improve filter features

UX issues to discuss:

[ ] yes/no buttons seems like does no effect from UX point of view
[ ] resolution date (expiry) is not present in most prediction markets and not reflected in UI
[ ] It is not clear what does opinions table contain
[ ] Opinions table is out of screen, when there are PMs with long description
[ ] Resolved PMs are positionaly displayed in overview table

General

Please make sure the following is done:

Pull request is onto develop
If you haven't already, have a look at
- https://github.com/bitshares/bitshares-ui/blob/develop/CODE_OF_CONDUCT.md
- https://github.com/bitshares/bitshares-ui/blob/develop/CONTRIBUTING.md

Code Preparation

Please review all your changes one last time before committing

[ ] Check for unused code
[ ] No unrelated changes are included
[ ] None of the changed files are reformatting only
[ ] Code is self explanatory or documented
[ ] All written text is properly translated (english language)

Testing

The branch has been tested on the following browsers (desktop and mobile view)

[ ] Chrome
[ ] Opera
[ ] Firefox
[ ] Safari

User interface changes

Delete this section if there weren't any UI changes. Please make sure you tested your changes in all themes

[ ] Dark
[ ] Light
[ ] Midnight

Please provide screenshots/licecap of your changes below

blockchainprojects / bitshares-ui