4.0.0 Alpha 1 for 21w11a

Repository version: 4.0.0-alpha.1+21w11a

Added

• Insets to replace padding added by background painters. They describe the inner padding of a panel (distance between the content and the panel's edges).
• A LibGui class with LibGui.isDarkMode to check for dark mode instead of looking in the config.
• Button dark mode support with textures originally by @shedaniel (#10)
• Improved mouse events that use an InputResult enum for cascading (for example, scrolling events can pass through to the scroll panel)
• WAbstractSlider.isDragging (#100)
• Mouse scrolling support for WScrollPanel and WListPanel
• ScreenDrawing.drawTextHover for drawing text hover effects

Changed

• WScrollBar: Scrolling speed increased to 4x the previous amount
• BackgroundPainter.VANILLA and BackgroundPainter.createColorful no longer have any padding applied
• All rendering now uses MatrixStacks.
• All implementation classes are now in the impl package or its subpackages.

Fixed

• Labeled slider rendering issues
• Memory leak in ScreenNetworking