Update proposal turnaround parameters

The current proposal flow takes 10 days to complete:

• 5 day voting delay
• 5 day voting period

This proposal updates three properties:

• Turns on the editing period (introduced in v3) to 2.5 days
• Sets the voting delay to 0.5 days
• Sets the voting period to 4 days

If passed, the proposal flow would take 7 days to complete:

• 2.5 day editing period
• 0.5 day voting delay period
• 4 day voting period

The main reason for the update is to move quicker. Post-fork, the size of the voting pool decreased significantly and is more aligned which should enable us to lower the time required to pass/reject props.

The periods were chosen with the goal of having a one week turnaround time:

• 2. 5 day editing period should be enough to integrate any minor feedback into a prop
• 0.5 day voting delay to prevent voters from seeing outdated props at voting period start
• 4 day voting period for voters to cast their votes

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