User SQLALchemy's Dialect pattern to build hand history parser architecture

[kissgyorgy]

http://aosabook.org/en/sqlalchemy.html
SQLALchemy has an abstract class called Dialect for which database specific implementations exists.
I feel that the same architecture could be applied to hand history parser class architecture.

Behind the scenes, the Engine references an object called a Dialect. The Dialect is an abstract class for which many implementations exist, each one targeted at a specific DBAPI/database combination. A Connection created on behalf of the Engine will refer to this Dialect for all decisions, which may have varied behaviors depending on the target DBAPI and database in use.