Support ERC20 tfchain transactions

[GlenDC]

Installation information

• jumpscale version: 960
• operating system: N/A

Detailed description

It should be possible to send TFT to an ERC20 address, as well as be able to register an ERC20 withdrawal address, using the JS tfchain lib.

Tasks

• [x] support encoding/decoding of ERC20 Transactions;
• [x] ability to register an ERC20 address;
• [x] ability to send coins to an ERC20 address (overloading the existing send_money method);