Clearly render proposal contents

[sschiessl-bcp]

General

Closes #2499

Component rendering received a complete overhaul and streamlined in terms of what gets displayed where. On top of that, account update now displayes the exact changes.

Every operation (54) now has it's own component with clear separation what is being displayed instead of one massive if else clause. Furthermore, rebasing was necessary to accomodate the changes for new HTLC that were done in old format.

With all that in mind, I request a bounty increase to 15. Total hours spent were 42.

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