Currencies in backtest

[eirik-thorp]

Introducing currencies in the backtest:

• Each ticker and future contract now has a designated currency parameter.
• Backtest porfolio has a designated currency.
• Transactions are transacted in the ticker currency and the net liquidation of the portfolio is recorded in the portfolio currency by converting transaction costs and P/L using a set of currency exchange tickers.

[codecov]

Codecov Report

Attention: Patch coverage is 79.51807% with 17 lines in your changes missing coverage. Please review.

Project coverage is 77.06%. Comparing base (db26e2a) to head (6626c0d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
qf_lib/common/tickers/tickers.py	76.00%	6 Missing ⚠️
...ata_providers/bloomberg/bloomberg_data_provider.py	50.00%	4 Missing ⚠️
qf_lib/data_providers/prefetching_data_provider.py	50.00%	3 Missing ⚠️
qf_lib/data_providers/exchange_rate_provider.py	80.00%	2 Missing ⚠️
qf_lib/backtesting/broker/backtest_broker.py	75.00%	1 Missing ⚠️
qf_lib/backtesting/portfolio/portfolio.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   76.97%   77.06%   +0.09%     
==========================================
  Files         227      228       +1     
  Lines        9169     9215      +46     
==========================================
+ Hits         7058     7102      +44     
- Misses       2111     2113       +2     

Files with missing lines	Coverage Δ
qf_lib/backtesting/broker/broker.py	76.92% <100.00%> (ø)
qf_lib/backtesting/order/order_factory.py	97.02% <100.00%> (-0.06%)	⬇️
...n_sizer/initial_risk_with_volume_position_sizer.py	94.64% <100.00%> (ø)
.../futures/future_tickers/bloomberg_future_ticker.py	87.87% <100.00%> (+0.78%)	⬆️
...containers/futures/future_tickers/future_ticker.py	86.29% <100.00%> (+0.11%)	⬆️
qf_lib/backtesting/broker/backtest_broker.py	88.88% <75.00%> (-3.12%)	⬇️
qf_lib/backtesting/portfolio/portfolio.py	98.98% <95.45%> (-1.02%)	⬇️
qf_lib/data_providers/exchange_rate_provider.py	80.00% <80.00%> (ø)
qf_lib/data_providers/prefetching_data_provider.py	78.94% <50.00%> (-5.43%)	⬇️
...ata_providers/bloomberg/bloomberg_data_provider.py	42.26% <50.00%> (+0.02%)	⬆️
... and 1 more

... and 1 file with indirect coverage changes

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[zeynepgultugaydemir]

on fridays we merge