Improve sliders

[ChronoQuote]

• SlideBar sliders now use the ID system that Slider3/Slider4/etc. sliders use, which allows the game to remember which slider is being used so that the player may move their cursor outside the slider when using it, improving QoL
• Add an OnSliderID=0 check to each MouseDown1 check so that hovering over a slider while using a different slider doesn't switch which slider is being used
• Add missing OnSliderID checks to various MouseOn checks to ensure that when using a slider, only that slider's tooltip is shown

Before: https://streamable.com/kzpfcx

After: https://streamable.com/01h5we