Add a mana bar for voting power and RC

Max mana is basically effective vesting shares:

https://github.com/steemit/steem/blob/master/libraries/chain/include/steem/chain/util/manabar.hpp#L94

Max RC is returned in the relevant API call.

The bar could be displayed in the toolbar and there could be a popup explaining the values on click, telling the user what to do about his perhaps not too great situation

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