Longer Strength II Potions

Adds new 8 minute Strength II Potions

Potions:

8 min Strength -> 8 min strength II (using glowstone dust)

1.5 min Strength II -> 8 min strength II (using redstone dust)

Splash Potions:

8 min Strength -> 8 min strength II (using glowstone dust)

1.5 min Strength II -> 8 min strength II (using redstone dust)

Lingering Potions will come in later versions