Translation cleanups

A number of cleanups and disentanglements to the current translator implementations:

• Extract a real abstract Translator interface
• Remove the mapping based approach from the FloatTranslator to make it actually accept floating point values unequal exact integers

saqc/core/translation/basescheme.py

@@ -17,7 +17,7 @@ import pandas as pd
 from dios import DictOfSeries
 from saqc.constants import BAD, FILTER_ALL, GOOD, UNFLAGGED
 from saqc.core.flags import Flags
-from saqc.lib.types import ExternalFlag, PandasLike
+from saqc.lib.types import ExternalFlag
 
 ForwardMap = Dict[ExternalFlag, float]
 BackwardMap = Dict[float, ExternalFlag]