Complete proposal execution flows

[brickpop]

• Allow to execute proposals that passed on token voting
• Show the execute button only when applicable
• Encapsulate the execution logic in two dedicated hooks
• Remove the logic-in-UI code
• Show the minimum veto voting power
• Show the minimum turnout
• Display the token symbol to signify that the unit relates to a token balance
• Format all the threshold numbers

Other:

• Using sequential if/then else flows to detect the proposal status
• Adding a "no votes" and "no vetoes" placeholder message
• Unify the "active" colours and make "executed" tags look different than "execute"
• Display votes consecutively and not in vertical uneven columns
• Lighter props passing by using hooks only where needed

[carlosgj94]

Potentially I think would be amazing if we could move the token related hooks outside of the plugin dirs and make them generic and consumable by the plugins.

I'm approving nonetheless, give that a thought and choose if you want that inside this PR or on another following one