Ntfs read fixes

[alexisbalbachan]

This PR is based on #2055, it had some issues when parsing certain kinds of files that were fixed here.

New Features:

• Sparse files can now be read/extracted correctly.
• Non-resident $DATA reads work across multiple fragments (data runs) and support negative run deltas.
• Multi-extent $DATA (runlists split across MFT records) is merged into a single logical stream.
• Root directory entries that were previously missing are now listed reliably.

How to test:

• Create problematic files that were breaking the current implementation:

•  fsutil file createnew C:\temp\sparse.bin 10485760
   fsutil sparse setflag C:\temp\sparse.bin
   fsutil sparse setrange C:\temp\sparse.bin 0 10485760
  
   fsutil file createnew C:\temp\uninit.bin 1
   fsutil file seteof C:\temp\uninit.bin 10485760
  
   fsutil file createnew C:\temp\multiextent.dat 8589934592; 1..50 | ForEach-Object { fsutil file setshortname C:\temp\multiextent.dat "ME$_.TMP" 2>$null }
  
  
  
   fsutil file createnew C:\temp\big.dat 8589934592
  
   fsutil file createnew C:\rootfile1.bin 1024
   fsutil file createnew C:\rootfile2.bin 2048
  
   fsutil file createnew C:\temp\bigfile.bin 2147483648
   for ($i=0; $i -lt 500; $i++) { Add-Content -Path C:\temp\bigfile.bin -Stream ("stream" + $i) -Value ("stream-data-" + $i) }
  

• Run ntfs-read and cd into the corresponding directories, try ls and hexdump/cat