Fixed lots of problems:

 * Extension Discovery now works as expected
   - removed nature write to file stuff (managing this is difficult and
we didn't use it)
   - fixed recursive search to not include source folders from other
projects but also source folders containing only .ext files
   
 * Launching of the platform
   - fixed main definition
   - Checked projects in LaunchConfiguration are now properly evaluated
Removed checks to ease deployment.
Tried to resolve missing .class file problem on deployment.