Support OrderBy(string)
Verify free-text sql fragments in SqlExpression
Validate SqlFragments where free-text is allowed
refactor Exec methods so they share similar structure
Refactor OrmLite managed exec function so it can be managed/overwritten, added example for executing each operation n Times.
regen codegen OrmLite.signed
clean up OrmLiteExecFilter
Clean exec code, CreateCommand should never throw