Made Manual Slider consistent with other sliders

Square wave slider now supports different duty cycles besides 50%

Added SliderPerlin and SliderNoise classes

Changed how class instances are created.

Changing the period of a slider while the slider is running now smoothly transitions to the new period without causing the slider value to jump suddenly.

Fixed typos because I'm stupid

Added rest of setter and getter functions for consistency and safer assignment and retreval of values

Added Slider:getValue() function for consistency and readability

Fixed dependency issue

Added manually controlled slider. Hid base Slider class