Fixes for 0.8 bugs

Version 0.8.1 - 8/29/2019

• Fixed a bug that was causing VFS temp folders not to be cleaned
• 7zip Extraction code now shows a progress bar
• Told 7zip not to ask for permission before overwriting a file (should fix the hanging installer problem)
• Fixed several places where we were using long-path incompatible file routines
• Changed the work queue from FIFO to LIFO which results in depth-first work instead of breadth-first
  TLDR: We now fully analyze a single archive before moving on to the next.