Procedural size nodes

Need a reorder size nodes function, collapse needs debugging, still that
nullref when closing the tooltip
Procedural size nodes inserted in order
Made node collapse buttons extend length of node
Size nodes insert in order

non-size nodes placed after the initial size nodes were causing the size
groups to be split
Fuel tank subcategories, engines sort by thrust
Merge pull request #6 from Crzyrndm/Development

v2 Prototype