Request: LIFO cost basis option

**Is your feature request related to a problem? Please describe.**
For traders with multiple sell orders in the same stock, it would be handy to know the cost basis and profit-loss status of that position based on the "Last In First Out" accounting method.

**Describe the solution you'd like**
A toggle or switch in the settings that you can activate in order to show cost basis via the LIFO method. Perhaps there are other desired accounting methods as well.