Calculator 1.1.2

• Copy to clipboard after pressing Enter (using pyperclip if available, thanks to @Jens-3302)
• Persistent storage of last result in variable x, (e.g., 1/x) between sessions (thanks to @Jens-3302)
• Support for factorials with 5! or (3+2)! (thanks to @Jens-3302)
• Support for ^ as power and xor as bitwise XOR (thanks to @Jens-3302)
• Implied multiplication handling (e.g., 2pi becomes 2*pi) (thanks to @Jens-3302)