Make ColumnLike with only one type

[darkfrog26]

Currently ColumnLike has two generic types: 1.) the type from the database, 2.) the type it should be used as in Scala.

I think we should only have the type in the database and leave it up to mapper, queries, etc. to do on-demand conversion as different queries need data in different ways (Option[Int], Int, Ref, String, Long, etc.)

This should both simplify setting up the tables in the first place as well as increase the flexibility of the system overall.