NEO Sega Master System Myth cart menu + menu source code released!

The NEO SEGA Master System is ready for sale, here is the menu source code for dev. 

Final spec:
* support all sega master system (sega4) games
* support save
* support cheat code, can enable/disable the cheat code in the game playing, just simple to press one switch then can swap it. When the cheat code function enable, LED = RED, when disable LED = GREEN.
* support return to menu function (software reset)
* support FM sound
* come with 256M neo2 myth flash cart and SL4 programmer

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