Improvements

[jackyarndley]

• Normalize palette offset to be a float from 0 to 1
• Rearrange palettes to have RGB instead of BGR formatting
• Remove hardcoded default palette to use file instead
• Fix rare crash with '-' signs or others in the fields
• Have enter submit field value
• Improve fields to be more easily edited
• Have counter for reference number
• General UI cleanup and refactor
• Investigate separating zoom mantissa and exponent for easier editing
• Add create zoom out keyframes option
• Have value shown when mouse cursor is hovered over image, such as iteration count, and smooth factor
• Implement undo/redo options