Add aliases for SELECT queries.

[fr33r]

Description

These changes adapt the SELECT query generation to include the table alias in the column list, as intended.

Rationale

This essentially was a bug - the alias was being included in the columns listed within the WHERE clause, but not for the columns in the SELECT portion.

Suggested Version

v1.5.0

Example Usage

package main

import (
	"fmt"
	"time"

	"github.com/freerware/morph"
)

type Starship struct {
	ID               string
	Name             string
	ManufacturedAt   time.Time
	DecommissionedAt *time.Time
	AccessCode       string `db:"-"`
}

func main() {
	s := Starship{
		ID:               "123",
		Name:             "Millennium Falcon",
		ManufacturedAt:   time.Now(),
		DecommissionedAt: nil,
		AccessCode:       "secret",
	}

	table := morph.Must(morph.Reflect(s, morph.WithTag("db"), morph.WithTableAlias("SHIP")))
	fmt.Println(table.SelectQuery()) // SELECT SHIP.decommissioned_at, SHIP.id, SHIP.name FROM starships AS SHIP WHERE 1=1 AND SHIP.id = ?;
}