New themes

[EggPool]

This POC uses an html/js theme from mBitcoin.

Since the system uses templates, it's easy to change the wallet look.

I'd like to have at least:

• a proper mobile only theme
• a bootstrap desktop theme

No need for fancy graphics, rather a minimal and nice looking, usable wallet.

Inspiration/port from other crypto wallet are ok if the source licence allows that.

[EggPool]

Reference theme is the "Material" One. It's a live thing, since the wallet is not in stable state for now.