Sar Thumbnail Handler

• #2 : Actually included the SarConvert file this time, Oops.
• Added Bicubic Filtering to shader, should reduce blockyness from upscaling on some shapes
• Added optional High Resolution rendering:
  • Install script will prompt you if you want it or not on the shell extension, if you don't do anything, it'll default to no after a few seconds, if you want to disable or enable it later, just run the script twice (to remove and install it again)
  • SarConvert also supports it, enable by passing a negative size parameter, eg. -1024 <path to sar file> will do a HD rendering of the sar file, while 1024 <path to sar file> will do a standard one