Bug fixes and improvements

• Improved progress window behavior
  Progress creation has been removed for some small objects so the window doesn't refresh as often which speeds up export a bit and causes less blinking.
• Added object hashing
  This will help for large projects to get rid of potential duplicate objects, thereby optimizing file size.
• Fixed a crash when trying to use some sc2 files as external file.
• Fixed some bugs with texture settings
  Now external files option and quality option for Raw textures should work properly