Conversion code completed (at least basics)

1) Cleaned up usings.
2) Removed ToSQLDbType,ToDbType, and ToType as they are no longer
needed.
3) Switched To to use the new conversion code.
4) Removed ToBool and ToInt.
5) ToBase64String and ToEncodedString extensions for byte arrays renamed
to ToString.
6) Combined a number of Is* items on char to simply Is function.