Initiate move of SQL expression language to separate file.

The SQL expression language functions and constructors were moved to a
separate file. Developers may want to just use the SQL expression
language to create SQL strings and not want the added overhead of the
object relational mapper and SQL execution code. Thus, the code related
to creating SQL string statements was moved to a separate file that
could be used by itself without the orm library.

The SQL expression language has been named Spengler since Egon will use
Spengler in its operations to have Egon Spengler. These names might need
to change in the future.
Move SQL expression language to separate file and module.

Completed removing redundant code between Egon and Spengler and
separateing code base between orm and SQL expression language similar to
the codebase for SQLAlchemy, the inspiration for this library.
Initiate implementation of 'SELECT' clause.