v5.0

• Renamed IsImplicitAutoIncremented to IsImplicitAutoIncrement (breaking change)
• Fixed Execute(Expression) incorrectly calling parameterless struct constructor instead of zeroing out
• Fixed strings not concatenating correctly with +
• Added string.Concat for 2, 3, 4 arguments
• Added support for unary +/- operators
• Made SqliteConnectionOptions.Orm non-nullable and set default value
• Made Orm.TypeSerializers & Orm.Default settable
• Made DefaultJsonOptions a property of Orm
• Improved some documentation comments & whitespace & syntax