Fix SAT warnings (#14202)

* Fix SAT warnings

- checkstyle.ModifierOrderCheck
- checkstyle.OneStatementPerLineCheck
- checkstyle.NeedBracesCheck
- PMD.UseStandardCharsets
- PMD.UseCollectionIsEmpty
- PMD.UnusedLocalVariable
- PMD.SimplifyBooleanReturns where reasonable, suppress where
readability is better without change
- PMD.SimplifyBooleanExpressions

* Include StandardCharsets

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

bundles/org.openhab.binding.resol/src/main/java/org/openhab/binding/resol/handler/ResolThingHandler.java

@@ -308,6 +308,7 @@ public class ResolThingHandler extends ResolBaseThingHandler {
     }
 
     /* check if the given value is a special one like 888.8 or 999.9 for shortcut or open load on a sensor wire */
+    @SuppressWarnings("PMD.SimplifyBooleanReturns")
     private boolean isSpecialValue(Double dd) {
         if ((Math.abs(dd - 888.8) < 0.1) || (Math.abs(dd - (-888.8)) < 0.1)) {
             /* value out of range */