Add resolving of user routing and some small fixes

[matthijsvdmeulen]

As I needed some javascript code for parsing an x32 scene file, I wanted to contribute back some fixes and changes I made for my own project:

• The url for the link icons fixed
• Fixed a simple bug for any channel values lower than -10 or +10 having extra empty items in the array, by removing any items with only whitespace after parsing each line
• Added functionality to read the rest of the file header, and displayed the scene note if it was set
• The big one: added full resolving of user routing, and tweaked the physical input list to correspond to how X32 edit shows it

[lucaelin]

This is amazing! Thank you so much!