Fix Issue #60: add rawcode to key mapping for macOS

[Golevka2001]

Please provide Issues links to:

• Issues: Different rawcodes for keystrokes on macOS and Linux #60

Provide test code:

package main

import (
	"fmt"
	"time"

	hook "github.com/robotn/gohook"
)

func main() {
	s := hook.Start()
	defer hook.End()

	tout := time.After(time.Hour * 2)
	done := false
	for !done {
		select {
		case i := <-s:
			if i.Kind == hook.KeyDown || i.Kind == hook.KeyHold {
				if i.Keychar == 'q' {
					done = true
				}
				fmt.Printf("kind: %v, rawcode: %v, keyname: \"%s\"\n", i.Kind, i.Rawcode, hook.RawcodetoKeychar(i.Rawcode))
			}

		case <-tout:
			fmt.Print("Done.")
			done = true
		}
	}
}

Description

As mentioned in #60, the keycode on macOS keyboards does not match the one defined in tables.go.

So I referred to https://ritter.ist.psu.edu/projects/RUI/macosx/rui.c and added rawcode mappings for macOS.

This is the test result:

(the first image corresponds to the modified code)

(and the second image corresponds to the original code)