Hi,
yes, the tour_editor.html can be deleted,
but not the tour.swf - that's the Flashplayer, it will be used when the system/browser is not HTML5+WebGL/CSS3D capable (e.g. older systems or systems with low-end graphics).
About the plugins - the ones that will be not used by your tour, can be deleted of course - when no map, no sound, no video will be used, then the related plugins can be deleted - the textfield.swf should be not deleted - that's for the text support in the Flashplayer.
But if you want a HTML5-only tour, you can set html5=only the html file and delete also all swf files.
Best regards,
Klaus