Use 1/0 instead of True/False in TVBoolean.java

The use of True/False prevents the plotting of booleans, as those values
cannot be parsed as doubles. While it's conceptually more pleasing to
use the actual Python keywords for booleans, numbers will work just as
well and allow plotting. #337

trick_source/java/src/trick/tv/TVBoolean.java

@@ -23,7 +23,7 @@ public class TVBoolean extends VSBoolean implements TrickViewFluent<TVBoolean.Fo
 
         Boolean {
             public String format(boolean value) {
-                return value ? "True" : "False";
+                return value ? "1" : "0";
             }
         };