CopyQ Command bugs - Icon uses absolute path + Save incomplete

There are 2 issues:
1. When you add your own icon (browse) it is attached with a full path even when it could be relative (not portable).
2. I understand that the "Save Selected Commands" is supposed to save the complete setup but the icon is not included in the ini file. As per (1) above the path is also absolute.

Start with the code handling custom icons selected through the browse action and the Save Selected Commands export. Trace how icon paths are stored and how the exported INI data is written and restored. Done means custom icons use portable paths where possible and are included in the saved setup.

Written by the indexing model from the issue text.