Ctrl + Enter to submit Editor generator

When the user is on the editor generator form in the input box, they can
now use Ctrl + Enter (or Cmd + Enter on Mac OS X) to submit the form and
do the recording, speeding workflow a bit.
Prepopulation support for editor generator

Adds additional logic to the show() method of the EditorGenerator such
that the following sources are searched for input to try to prefill the
text field: selected text from the editor, active field text from the
editor, an HTML blob from the clipboard, a regular text blob from the
clipboard.
Merge branch 'add/easier-editor-22' into develop

Brings in automatic prepopulation of the editor generator's input field
and support for Ctrl + Enter to submit the form.

Automatic prepopulation is done from the user's current text selection,
the user's current field, any HTML blob from the system clipboard, then
any text blob the system clipboard. The first usable block of text found
is used.

Given the new automatic prepopulation/selection and Ctrl + Enter input
keystroke, advanced users will be able to do a "quick add" be combining
keystrokes instead of having to support by cluttering the interface.

- Ctrl + T then Ctrl + Enter: record sound w/ prefilled text, which will
  allow the user to either use a text selection or the active field
- Ctrl + T then Ctrl + V then Ctrl + Enter: record sound w/ clipboard,
  replacing any prefilled text from a text selection or the active field

Closes #22.