Add process-working-symbolic, overhaul 22px animation, use KDE gear
The icon now uses the KDE gear.
The symbolic version, which many popular icon themes also have, is only one frame that can be rotated with code rather than playing all the frames of the SVG.
The 22px animation is now like the 16px one and therefore looks much more like a gear. BusyIndicator_KDE_Gear
Edited by Björn Feber