Display feeds as tree in RSS downloader #18440
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This PR changes the RSS downloader dialog to use a tree for its feed list.
It is annoying if there are a lot of RSS feeds to be selected. By using a tree display it reduces this one-by-one selection effort and is more organized and consistent with the RSS reader feed list.
Closes #16802, #1805.
Currently not adding icons for the tree as the previous feed list didn't, but maybe it is better to display one to indicate one is a folder or feed?
Also for the root folder is there need for a name?