Generate source features and moved source features to separate category

plugins/org.yakindu.sct.model.sgraph/build.properties

@@ -10,9 +10,9 @@
 bin.includes = .,\
                model/,\
                META-INF/,\
-               plugin.xml,\
-               .project
+               plugin.xml
 jars.compile.order = .
 source.. = src/
 output.. = bin/
 jre.compilation.profile = J2SE-1.5
+src.includes = .project