Release icewm-3.3.0

Add preference ToolTipIcon to control the icon in tooltips.
Add support for nanosvg as a replacement of librsvg:
configure --disable-librsvg --enable-nanosvg.
Fix for setting focus on passive motif dialogs.
When looking for a focusable window, avoid rolled up windows.
When a focused window hides or rolls up, focus some other window.
Add "getClass" and "setClass" commands to icesh.
Let icesh implicitly select windows at most once.
Allow empty color specifications.
Support tabs in task grouping.
Updated translations: Turkish

shasum icewm-3.3.0.tar.lz 89a092de95fa163fcde1df9f0c386e6052690f19