Autopsy on Mac OS X and Build Script Updates

## 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.
* Build scripts updated to create 32 and/or 64 bit installers for Windows.