- Added a params method for combing an arbitrary number of UPaths

[martindevans]

• Added a params method for combing an arbitrary number of UPaths
  • Mirrors https://msdn.microsoft.com/en-us/library/dd991142(v=vs.110).aspx
• Added explicit methods for the common cases of combining 3 and 4 paths (saves allocating a params array in these cases)
  • Mirrors https://msdn.microsoft.com/en-us/library/dd784047(v=vs.110).aspx and https://msdn.microsoft.com/en-us/library/dd782933(v=vs.110).aspx

[xoofx]

Thanks for this! Sorry for the delay.