Autopsy on Mac OS X

## Changes and Fixes
* Sigar works on Mac
* Timeline works on Mac
* JavaFx Video Player works on Mac
* JavaFx Null Pointer Exception on closing case is fixed
* Changed look and feel to Nimbus (for Mac only) to fix cross-platform compatibility issues with the UI
* Re-added JPanel forms to VideoPanel files so they can be modified using NetBean's Swing Builder
* Improvements to JavaFx Video Player including a stop button, button styling, and error fixes.
* Added Project Properties so the correct branding title appears on the the Mac Menu Bar (only when built as a Mac application. This won't show up when running in NetBeans)