PathFinder status

[LogicParrot]

I'm going to submit a pull request. I think this is mature enough for this.
There are a few of things that can be improved in the pathfinder, and there is MUCH to improve with the AI.

Pathfinder:

• Special treatment to water, higher G cost.
  
• Add vertically aligned waypoints when a jump is needed, should assist the mobs in jumps.
  
• Move in straight line when there's a line of sight with target, this should also prevent mobs from stacking up as often as they do.
  
• Higher G cost around other entities to encourage spreading?
  
• Flight parameter. Flight is already "built in", it works by modifying some lines of code, I should make a constructor parameter for flight.
  

AI:

• Zombies should be more aggressive when it comes to hit frequency / hitting while walking.
  
• Cleanup of the older path-not-finder
  
• Pretty much everything. The current drawbacks of the AI are eclipsing the awesomeness of the Pathfinder, I set up something which works well for the zombies, but on the long run an overhaul should be made.
  

I think the code is ready for merging, (unless there's a performance bottleneck, please test that). As I said before, I have to take a break for a couple of weeks. After that, I'll resume adding features (and optimizations if needed).

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Please note that the zombies are not "optimal", their invisible paths are indeed optimal but they don't always follow them correctly due to the horrible AI, I did some AI changes which make this tolerable but there's room for improvement, this will be done when I resume this.
Nevertheless, it's no longer "brainless floating zombies".