• Added Select All, Select None, and Flip Selection to Detected Images window
• Added keyboard shorctus for Detected Images window
  • Ctrl + A: triggers Select All
  • Ctrl + X: triggers Select None
  • Ctrl + R: triggers Flip Selection
• Updated options change logic for Detected Images window
• Split Request Headers and related options on Options window
• Removed keyborad shortcut for New Download window
  • Alt + S had been removed
• Some code clean up