engine build 3.76

editor:
- fixed texture loading bugs
- added nodes, right click with a selected node to link to another
- added console variable 'show_node_links' , use 'show_node_links on' to
show all links
- fixed player position not loading in editor
- added 'resize <w> <h>' console commands
- launch with '-fullscreen' to fullscreen editor
engine:

- added mostly functional AI prototypes [ need testing rooms ]
- added support for node meshes
- more descriptive error logging
- fixed texture filesystem