Slider rows in the joints and controls tabs could only be reset through
a hidden right-click context menu. Replace it with a visible reset
button at the right edge of each row, disabled while the value is at
its reset target so the button column doubles as a modified indicator.
Rows split the remaining width equally between slider and label, and
labels clip at the button column. Adds an ImGui_ResetButton widget.
PiperOrigin-RevId: 956627705
Change-Id: I9c178f6cd1cc806c7ffd6f531acf7f2d470d9346
Yuval Tassa
98ecadcdf2