When the cursor is clicked outside of the slider knob,
the current behavior is that it will step up or down by the
Slider page step amount.
This commit adds an option to jump the slider knob
directly to the where the mouse cursor is on mouse down events.
This behavior is disabled by default. It must be enabled with
`Slider::set_jump_to_cursor()`.
Jump to cursor is enabled in SoundPlayer since most music players
have this behavior.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
Prevents discrete values from being skipped when using the mouse
wheel on SpinBoxes and proportional Sliders. Wheel delta can be
accelerated by holding Ctrl.
