Add Scaling Out again

[stfl]

Currently the Scaling Out logic is disabled.
The current approach works like this:

• open two trades -> one with TP one without
• if the TP is hit -> OnTrade() -> update the SL on the other trade

Sometimes TP as well as SL get called on the same candle because the SL is moved forward too quickly..
This is temporarily disabled.. Shouldn't be to hard but I currently don't have the need for that in my current backtest logic..