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151b01389a
In preparation for making a resampling session bar reader, make an abstract base class with the methods currently used by consumers of the reader; which should assist in making a drop-in replacement of the daily bar reader. While pulling out the interface, it does appear that `spot_price` and the minute bar reader's `get_value` are the same method but by different names, showing that there may be room for having both `MinuteBarReader` and `SessionBarReader` sharing a common `BarReader` interface.