Remove redundant pyautogui library, replace with existing keyboard module functions

[sugoidogo]

This PR fixes #25 and removes a redundant library. Replaces all usage of pyautogui.press with keyboard.send, which additionally supports modifiers, multi-key, and raw key codes. Worth noting is that the keyboard library also includes functions for recording and playing macros, also making PyMacroRecord redundant.

[sugoidogo]

It's also worth noting is that PyAutoGui also includes a dedicated hotkey function that could be used for the /key command for multi-key hotkeys, but sequences with modifiers would require more complicated logic using the hold context manager and there's no apparent function for macro recording/playback at all, which is why I feel like keyboard is the better choice.

[Lenochxd]

Hi, thank you for the contribution! Unfortunately, I’ll have to close this PR for 3 reasons:

1. Removing pyautogui would break existing functionality, particularly for buttons that rely on it to execute Python code.
2. The cleanup of both keyboard and pyautogui has already been made in the tidy-up branch.
3. This PR doesn't add the macro functionality requested in Macros? #25.

I appreciate the effort though, and hope to see more contributions from you in the future! :)