Adding syntax checking for upper case and lower case names

modeling/SysMLSec/AliceAndBob.xml

src/main/java/avatartranslator/AvatarAttribute.java

src/main/java/avatartranslator/AvatarBlock.java

src/main/java/avatartranslator/AvatarElement.java

src/main/java/avatartranslator/AvatarMethod.java

src/main/java/avatartranslator/AvatarSpecification.java

src/main/java/avatartranslator/AvatarSyntaxChecker.java

src/main/java/myutil/Conversion.java

src/main/java/myutil/NameChecker.java

src/main/java/ui/TGComponent.java