Now you can specify a CursorTheme key in /etc/WindowServer.ini. The
cursors are loaded from /res/cursor-themes/<name> directory. This
directory contains a Config.ini file with format similar to previous
Cursor section, except it uses relative paths.
This commit adds also Default theme, which uses cursors being
previously in /res/cursors.
The WidgetGallery is updated to match the new cursor path format.
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