Added support for FROM option [-columndelimiterregex='...'].  Refactored column splitting logic with generalization for CSV/TXT and simple/regex splitting.
Fixed wrong error message in ConversionException when converting Boolean to DateTime.
Added support for datatype Float.
Added support for literals and operators of datatype Float.
Removed double unit tests (float datatype).
Merge branch 'master' of https://github.com/WimObiwan/FxGqlC