Major rework of Java viewer clipboard handling

* Clipboard dialog UI significantly improved.
  - Fixes issue where scrollpane size did not track dialog size
  - Removed unnecessary JPanel
  - Adjusted default size of dialog to something more appropriate.
* Clipboard dialog is now a pure clipboard viewer
  - Window title now reflects thati fact.
  - Eliminates problems with concurrency and updating contents.
  - Clipboard dialog now updates contents if a clipbard transfer
    occurs and the dialog is visible.
  - Prevents possible loop condition when text in the scrollpane
    is selected (ie: selection buffer triggers clipboard updates).
* Custom TransferHandler implemented.
  - Limits the size of outbound clipboard transfers.
  - On Windows and Linux this implementation does not appear to
    provoke huge memory spike issue when the transferable is
    accessed.  Unfortunately, the OSX implemenation still
    suffers from this problem, but that is a JRE issue. For the
    time being, this at least minimizes the problem.  Additionaly,
    if an OutOfMemoryError is thrown, it's now caught and an error
    is logged rather than the viewer bailing out.
  - Vastly simpler implementation - the copy/paste methods inherent
    in the JTextArea are utilized for interfacing with the system
    clipboard.  This eliminates the need for checking permissions,
    as well as streamlining the code quite a bit.