Fix/Update method permissions

[amaury1093]

• Fix Approving some permissions don't save them in localStorage paritytech/dapp-dapp-methods#6
• Change of the approval system: "Approve" approves all the methods in a methodGroup. (e.g. if a dapp only requests 2 methods from the 'shell' methodGroup, clicking on "Approve" on the orange bar will approve all the 'shell' methods for this dapp). The Reason is to avoid the user for approving multiple time accountCreate methodGroup for the wallet, because the accountCreate methods are not requested at the same time.
• Performance improve: remove () => {...} functions in react render
• CSS fix

[parity-cla-bot]

It looks like @amaurymartiny signed our Contributor License Agreement. 👍

Many thanks,

Parity Technologies CLA Bot