Update UI with Disputable functionality.

[willjgriff]

Delay UI designs are shown here: https://www.figma.com/file/MbRABwEI6BH4iI6moYvveQ/%F0%9F%A4%9DAgreements-Master?node-id=35%3A6904

I believe all of the new input buttons and modals shown will correspond to new functions available in the Aragon API so we shouldn't have to reference the Agreements contract directly in order to execute those functions or create our own modals.

Each delayed execution action now has the following states, which are stored with the DelayedScript info in delayedScriptStatus excluding the Executable state, which requires calling canExecute() to determine:

• Active (/scheduled in UI)
• Paused (/challenged in UI)
• Executable (no UI icon/view for this yet)
• Cancelled (also cancelled in UI)
• Executed (/completed in UI)