ftx sub account support

[secwang]

subaccount api can use for connect markets. buy can't put order. need special http header xargs.

SUBACCOUNT="XXX"

[hall130]

I have completed this question and adjusted the leverage ratio, but I can't submit

[hall130]

我之前参考vnpy_ftx 新增了子账户以及杠杆倍率，子账户已经测试过连接没问题，杠杆倍率还未测试，如果需要https://github.com/hall130/vnpy_ftx/blob/main/ftx_gateway在这个链接

[meteorliu80]

@hall130 我自己尝试在网关文件加了子账户，只在FtxRestApi中加了，然后测试了价差和算法交易，都出现了问题，比如持仓未返回，价差只成交了单边等。你这个版本都能解决吗？

[vn-crypto]

Since FTX is closed now, I ll just close this issue.