Support for different base currency.

[josla972]

JPY is enforced as base currency in Japan (IBKR JP / IBSJ) and so the account summary unit shows up as USD with the $-sign.

I suspect that this also affects what thetagang thinks is available in terms of cash. Would it be easy to fix this?

Account summary
│ ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┓ │
│ ┃ Item ┃ Value ┃
│ ┡━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━┩ │
│ │ Net liquidation │ $1234 │
│ │ Excess liquidity │ $1234 │
│ │ Initial margin │ $1234 │
│ │ Maintenance margin │ $1234 │
│ │ Buying power │ $1234 │
│ │ Total cash │ $1234 │
│ │ Cushion │ 124% │
│ ├───────────────────────────┼────────────┤ │
│ │ Target buying power usage │ $12345 │
│ └───────────────────────────┴────────────┘

[brndnmtthws]

Theoretically it's not hard, I just don't have a good way to test it, and the IBKR API is complete dogshit so I'm hesitant to make any changes that might break the code. If someone has access to a non-USD account and wants to test it and submit a PR, then I'm certainly open to that.

[josla972]

I can test it on a JPY account.