implement vertical format option

[shueybubbles]

With the -F vertical switch you can orient results vertically:

sqlcmd -F vert -S sqltools2019-3 -Q "select top 5 name, database_id from sys.databases"

name        distribution_db
database_id 9

name        DWConfiguration
database_id 6

name        DWDiagnostics
database_id 5

name        DWQueue
database_id 7

name        keep_AdventureWorksDW
database_id 13


(5 rows affected)

I also fixed rendering of uniqueidentifier values.

[shueybubbles]

Fixes #21