Cancel all trigger orders + place order

[filipzeta]

Useful for FE when closing positions. Cancel all trigger orders for a given asset and then place one order on the same asset.

Tested locally in the following conditions:

• 55 trigger orders active -> completes in 6 txs
• 5 trigger orders active -> completes in 1 tx
• 0 trigger orders active -> completes in 1 tx