[Draft] Changed the exit session dialog and fixed exit button position

[KenjiPcx]

Summary of changes

• Changed exit button position
• Changed the exit confirmation button
• Changed the exit confirmation panel to use the built in modal manager
• Implemented the close session function to analyze the session and redirect to analysis page when done
• Implemented a simpler post session analysis function
• Fixed loader not appearing
• Tested close session and it works

Closes #60 and closes #61