Added Pet css sprite and removed genders from player css sprites

1. Added one sprite containing all of @Shaners' pets.

2. Fused male and female back together to 1 spritesheet again. Genders were removed although the same appearance should be obtainable with the new system! 

Proceed with caution!
The hairstyles had to be modified a little. Now there is 1 hairstyle for when players are not wearing a helmet yet. These have a "nh_" prefix in the name and the other hairstyles should be used if people are wearing a helmet. 

As both "gender" versions have been fused, often there are at least 2 or 3 versions for each item. I am not sure if there is any 1 to 1 mapping between the old and new names :( 

I took the liberty to flip the pets. These were aligned to fit the right side of the player. The pets can be moved around a little, but the alignment between pets should not be changed, or rather read, should not need to change, as I tried to align them before hand. If people don't like this, we can further experiment. I just wanted to get a sprite on the server. We can freely change this!