added editable text box to jump to specific frame + auto formatting

[JamesDarby345]

Adds editable text box that is limited to only numbers within the frame range, and when you hit the adjoining button you go to the appropriate frame.

The diff also contains a bunch of auto formatting to make the code friendlier to read.
This makes the code changes harder to find but they are:

• on_frame_change in eventHandlers
• changes to the Layout section
• self.frame_edit_display & button_frame_change setup near the top of init

I also added a .gitignore to ignore the pycache and vscode specific files.