Worked on exception system.
Now it shows which program caused a syntax exception. Now it also shows the variable identifier that is unknown. Special handling of empty programs. If failed to enter debug mode because of syntax exception, it will no longer try to continue the debugging process, thus throwing IllegalStateExceptions for every program.
src/dibugger/debuglogic/exceptions/VariableNotFoundException.java → src/dibugger/debuglogic/exceptions/IdentifierNotFoundException.java