* Store feeds in kEnqueueFeeds/etc messages as paths? hmm
	* This way, if the user edits the feed after it is enqueued but before
	processing, the changes will be applied.
* Support for clearing queue
* Show progress
	* With progress bar
		* Ran into a slight problem when trying to set the maxValue and
		value when in MainWindow::MessageReceived (kProgress)-- it would
		crash every time, without fail. Even with float constants that
		work when used in MainWindow::_InitInterface. Weird, idk
	* With indicator in the feeds list
* File error-handling
	* e.g., Utils.cpp's userFileError
* Remove unnecessary `new`-- make sure to delete everything
* Check if arg is a file or not (treat appropriately)
* No hardcoded paths
* Default column layouts for ~/feeds and ~/config/settings/Pogger/Subscriptions
* Show in desktray
	* Make archivable
	* Get menu working
* Proper scripting support
* Multiple downloads at once?
	* Array of thread_ids for multiple DL threads?
		* In which case, it'd probably make sense to only spin them
		  up as necessary, and kill when everything's done.
			* That'd require a proper queue system, instead of just
			  spamming data to the download thread lol
				* Using a proper queue list would give faster 
				  results to Notifer about how many feeds are
				  enqueued (so things *feel* faster)
* Open With support
* Open As support
* File extension support