Moved Node class + helpers to Node.h, moved includes to top of file
Added 2-opt algorithm

Working well on input0.txt but gives no points on Kattis.
Added TSPReslt struct to also return the total length of the found path
Rewrote opt2 to look for the best improvement each step
Moved Node function definitions to Node.cpp, fixed warnings
Reverted opt2 walking through and looking for the best swap

It took way to long time
Added function to parse files from TSPLib to use in testing
Removed unnecessary moves
Fixed distance function
Fixed errors in Kattis, 8 points on Kattis using 2-opt