Ctrl+shift+O removes too much import static extension

[dvojtise]

in the current xtend version, the detection of unused import doesnt correctly detect the use of the import static extension. A user who is used to clean his code (typically with Ctrl+shift+o) will remove required import and breaks his code. The solution is probably 2 folds:

• report issue to xtend developpers
• have a higher level process which ensure that we have the correct import in the project regarding the aspectized model. this task is probably to be included in K3SLE (not K3AL itself) that is in the global process of building aspect in order to build a language.