[FEATURE] RT-2447: BRL Tab
[FEATURE] RT-2463 Balances sidebar widget LESS

Add LESS file for displaying account balances in a sidebar widget.
[FEATURE] RT-2463 LESS: Generalize currency colors

Colorization by currency is no longer used by Balance tab only, but also
by Balances sidebar widget.
[FEATURE] RT-2463 Sidebar: Add Balances widget

Add Jade template for sidebar balances widget.
[FEATURE] RT-2463 Balances wid.: Template includes

Include sidebar with balances widget in Send, Trade, Convert tabs.
[FIX] RT-2463 Remove sidebar widgets horizontal padding
[TASK] RT-2442: BTC Tab fix
[FIX] RT-1227: Client should parse "address?dt=xxx"
[FIX] RT-2399 Wrong currency asked for conversion when removing a trusted gateway