Update To Emulator Speed Choices & UI

[BryanGoble]

Description

This PR modifies only emulator_controls.py to update some of the UI and adds additional speed options up to 32x #352.

Changes

• Remove unused speed button references in init
• Modifiy update() and _add_speed_controls() to be dropdown style rather than individual buttons
• Add _open_speed_menu() to handle the dropdown
• Modify speeds variables to include an 8x, 16x, and 32x option
• Add right-side margin to 'Other Settings' buttons
• Update Command Line arguments with the new Emulator Speeds
• Update options with new speeds in Debugging section of Wiki/pages/Getting Started.md

Checklist

• [x] Black Linter has been ran, using --line-length 120 argument
• [x] Wiki has been updated (if relevant)