Menu navigation take 2

[aspic]

Continues the cleaning of menus removes a lot of unused views. This includes:

1. Transactions are now a sub-menu of account
2. When account has been selected, going into menu reflects that (send, receive, transactions of account)
3. Extracted the "content" into it's own Content component, so that we can do things with the header later on

Menu states became a bit messy now (what to show depends on menu item (wallet, about etc), selected account and then account action. We should probably find a way to simplify this in the future.

[Citrullin]

From an UI perspective. I find the previous UI version I had more user friendly. I guess the user doesn't really care about the address. The amount on the wallet is more important. That is why the amount was large before and the name of the wallet small in a separator. We can also put the name at the secondary place. I would definitely place the amount of Nano in focus.

[Citrullin]

Also in the menu:
I wouldn't select main from send and receive.
Selecting the wallet after send or receive

Menu -> Send/Receive -> Select wallet -> QR Code/address
I like the small header with the number though. So that the user still sees the context where he currently is. It is a great improvement. Thanks! :)

Generate address doesn't make sense at the frontpage. I think that was my naming right? It should be generate wallet. Or add wallet, or something. ^^

The QR Code can fill most of the screen, no issue with that. Therfore the nano address can get removed. It is, on my phone, even not completely visible. Some of the last characters are not visible.

I really need to fix this scrolling. This is getting very annoying 🙈 :D