Adding attack name checking

.idea/misc.xml

modeling/SysMLSec/at_zeuszitmo.xml

src/main/java/attacktrees/Attack.java

src/main/java/attacktrees/AttackElement.java

src/main/java/attacktrees/AttackNode.java

src/main/java/attacktrees/AttackTree.java

src/main/java/translator/JKeyword.java

src/main/java/ui/AttackTreePanelTranslator.java