beta health system as a gamerule

make a gamerule that makes eating food regenerate health instead of hunger like it was before beta 1.8. that gamerule, will also make it so that a food value will fill half as it used to, so a food that fills 4 hunger bars will heal 2 health bars. the gamerule will also remove the hungerbar once activated, and once disabled, will bring the normal hunger back. (legacyhunger true, and legacyhunger false) this is an option for players that dont like the post beta 1.8 and release 1.9 hunger