329198: Support PDE/Equinox bundles in Eclipse IDE 

Initial commit:
- new builder and nature for Virgo PDE projects (new bundle *.pde.core)
- change parent pom.xml file and feature.xml file to include new bundle
- add new project wizard for creating Virgo PDE projects (regular 
  bundles and WABs)
- update Virgo Runtime wizard to include an extra page for setting up
  a PDE Target Platform
- Change Virgo Server editor to include a new section for   
  reloading/editing the associated PDE Target Platform
- new decorator for decorating PDE projects for Virgo (RT icon overlay - 
  top left)
- new decorator for decorating Virgo Servers with an associated PDE
  Target Platform (Plugin icon overlay - top left)
- Server Runtime lifecycle listener to delete PDE Target Platform when
  associated Virgo Runtime is deleted
- use of NLS in new UI components and some NLS in existing UI 
  components

Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=329198
54 files changed