Opt-out from v3 node billing

[zaelgohary]

threefoldtech/ledger_chain#1066

[zaelgohary]

Blocked on threefoldtech/ledger_chain#1066

[zaelgohary]

• Implemented opt-out from billing in tfchain, grid client & playground packages.
• Stopped propagation on icon click in node actions

Functionality should be ready once tfchain is released.