Don't force public variables to use Hungarian notation (#8774)

People generally have expressed a dislike for the Hungarian notation
used in member variables, especially in examples/templates, and our
styleguide shouldn't be forced on downstream consumers, so this removes
all Hungarian notation from the examples/templates.

There are _some_ benefits to Hungarian for private member variables
(like knowing what's a member vs. local in a PR review) so we'll keep
private member variables the same for now, but public variables should
no longer use Hungarian notation, since it looks much worse. A new PMD
XPath rule has been added to accomplish this goal. Some other
non-compliant variables were fixed for the new rule.

epilogue-runtime/src/main/java/org/wpilib/epilogue/EpilogueConfiguration.java

@@ -15,7 +15,6 @@ import org.wpilib.units.measure.Time;
  * A configuration object to be used by the generated {@code Epilogue} class to customize its
  * behavior.
  */
-@SuppressWarnings("checkstyle:MemberName")
 public class EpilogueConfiguration {
   /**
    * The backend implementation for Epilogue to use. By default, this will log data directly to