Hold down Ctrl to avoid using folder browse dlg

That dialog just plain sucks...you can't type in a path, for instance.
Don't want to mess with the keyboard shortcut

See previous commit/added comments
Added a menu item to open a directory in Explorer
Try to improve control flicker
Merge branch 'master' of https://github.com/flarn2006/NBTExplorer
Add Open in Explorer to context menu