Rename dialog: UI suggestions

[jdalbey]

The current rename dialog has a few very minor peculiarities. Here's an example:

1. The title "New name" seems slightly incorrect as we aren't providing an entirely new name we are just modifying the current name. So the title of "Rename recording" would seem to me to be more accurate.
2. Why doesn't "Cancel" appear as a button? It seems like it should be styled just like the Save button.
3. If I make no changes to the name, Cancel behaves exactly like Save. That was a surprise to me because I initially assumed that since there were two functions they would behave differently. I concluded that the function that would most likely complement Save would be Not Save, that is, Delete. So I was blithely tapping Cancel thinking it was deleting recordings I didn't want and was surprised to see a long list of files appear in my recordings list that I had assumed I had deleted. I suggest the Cancel button should appear disabled until the user has modified the name. At that point Cancel becomes enabled to imply that its function is to ignore the user's modifications.
4. Add a separate Delete button. This would be a convenient place to offer the user a chance to remove recordings that aren't wanted, as requested in Add a delete button.  #128. (Pressing Delete might bring up a confirmation dialog before actually erasing the recording).
5. I suggest removing the "Don't ask again" checkbox. There is an obvious item on the Settings page that dictates whether or not this dialog appears. The checkbox here is redundant and adds clutter.