Updated Base & Food health gain modifier

[Zoruea]

Instead of calculating hp by capturing the entire health bar, we now calculate health provided by food and apply it using attributes to increase compatibility with other mods that modify player health.

[Zoruea]

This should also help fix issue #25

[MarioSMB]

Just a heads up, maxhp is still referenced around line 130, not sure if that's intended.

[Zoruea]

Ahh, that's not intended.
Unfortunately, that chunk from 127-134 I couldn't get working properly in testing with the changes to health calculation so I left it as is. Using the Player.getHealth() method didn't seem to be working no matter what solution I tried to apply the speed boost at full health so I gave up on it.
In theory all it would take to get it working is swapping the maxhp variable with one that gets the player's current hp and compares it to their maxhp, everything else there already uses the attribute system properly and works.