Prepare for release 1.2.0
renamed grammar and updated target platform
Fix renaming issue and add nice icons and labels
Remove need of String for versions
added validation rules for deprecation and new validity rule
upgrade .ui to xtend
addded quickfixes
add support for importURI and enhanced support for version ranges
use the reigth string value converter
add rule for options and re-ordered them
add condition for checking options on location
remove dependency to PDE to generate .target file
added various validation rules and associated quickfixes
generate resolved TP with included ones
removed pde fragment and update the build