Improved design, added new components

Sum of Improvements:

• Improved and modernized design and appearance.
• Improved functionality.

New components:

• ColorPicker.lua
• DropdownMenu.lua
• HorizontalLine.lua
• LabeledColorInputPicker.lua
• LabeledNumberInput.lua
• LabeledRadioButton.lua
• LabeledToggleButton.lua
• VerticalSpacer.lua