feat: adds color controls and pause button

[sirPixieJerry]

CHANGES

This pull request adds the first three buttons of the user menu. A pause button to pause the rewind, an undo button and a redo button to scroll through the steps manually.

• Adds pause, undo and redo button to HTML structure.
• Adds pauseRewind and setPauseRewind to rewindColors.ts.
• Adds updateStepIndex, undoColorChange and redoColorChange to rewindColors.ts.
• Updates recordColorChange according to changes.