Battle system update

I've noticed that my battle system was a bit rusty so I decided to update it:

-  Enemies are now encountered less often (so you at least have a chance to move for a while before encountering something)

- Some enemies now have a chance of dropping revive, since previously the only revives you got were from the chest (After you used up all of your revives from the chest the game becomes pretty much unplayable if your party is heavily weakened)

- Made it so it's easier to run from Collarflowers, because during initial release they were nigh impossible to run from but I realized how annoying that must've been lol

And overall the game is now less frustrating to play.