func (c *Cursor) Save() {
	cursorLoc, _ = c.Location(nil)
}
save the cursor location
package terminal
import (
	"bytes"
	"syscall"
	"unsafe"
)
var COORDINATE_SYSTEM_BEGIN Short = 0
var cursorLoc Coord
type Cursor struct {
	In  FileReader
	Out FileWriter
}
func (c *Cursor) Up(n int) {
	c.cursorMove(0, n)
}
func (c *Cursor) Down(n int) {
	c.cursorMove(0, -1*n)
}
func (c *Cursor) Forward(n int) {
	c.cursorMove(n, 0)
}
func (c *Cursor) Back(n int) {
	c.cursorMove(-1*n, 0)
}