JBIDE-13456 Move palette implementation from vpe module to jst module

Plugin org.jboss.tools.vpe.ui.palette cleaned.
Only PalettePlugin class is left and marked as deprecated.
JBIDE-13406 BrowserSim: Integrate Firebug-Lite

Added FireBug Lite integration - FireBugLiteLoader.java
Added Tools and Tools->Firebug Lite menu items