Created the complete organization of npcs, that way, it is possible to create own files for npcs, no longer depending on being together with the monsters
this pull request was made to be worked together with the canary project: https://github.com/opentibiabr/canary
The spawns npcs is "yellow" and spawns monsters is "red" (the old)
With this change, the map will automatically create an "npc.xml" the first time it is saved.
It is possible to edit only the xml, it is not necessary to add or modify the npc by opening the editor map
Thus, there is a script for npcs, similar to how it works with old spawns
Removed libxml2 to use pugixml.
Fixed a bug with the progress bar.
Changed some things in most xml files that pugixml did not like.
Updated the Visual Studio project.
Any NULL symbol has been changed to nullptr.
This most probably broke the CMake that was recently added.
And probably some other things.
Clean git repository since the old svn / git mess was pretty much
unrecoverable unfortunetly. I would have liked to keep the history
for posterity, but that proved to be a futile quest.
