[MRESOLVER-669] Clean up (#51)

Changes:
* clean up hamcrest deps
* drop use of commons-lang (was never dep, upstream dropped it)
* align resolver with maven 3.9.9
* reformat

---

https://issues.apache.org/jira/browse/MRESOLVER-669

Author: cstamas

.mvn/placeholder.txt

@@ -57,7 +57,7 @@
   </distributionManagement>
 
   <properties>
-    <mavenVersion>3.9.6</mavenVersion>
+    <mavenVersion>3.9.9</mavenVersion>
     <resolverVersion>1.9.22</resolverVersion>
     <antVersion>1.10.15</antVersion>
     <javaVersion>8</javaVersion>
@@ -213,6 +213,12 @@
       <artifactId>junit</artifactId>
       <version>${junitVersion}</version>
       <scope>test</scope>
+      <exclusions>
+        <exclusion>
+          <groupId>org.hamcrest</groupId>
+          <artifactId>hamcrest-core</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>org.apache.ant</groupId>
@@ -228,13 +234,7 @@
     </dependency>
     <dependency>
       <groupId>org.hamcrest</groupId>
-      <artifactId>hamcrest-library</artifactId>
-      <version>${hamcrestVersion}</version>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.hamcrest</groupId>
-      <artifactId>hamcrest-core</artifactId>
+      <artifactId>hamcrest</artifactId>
       <version>${hamcrestVersion}</version>
       <scope>test</scope>
     </dependency>

pom.xml

@@ -26,7 +26,6 @@
 import java.util.Map;
 import java.util.Properties;
 
-import org.apache.commons.lang3.ObjectUtils;
 import org.apache.maven.resolver.internal.ant.types.Authentication;
 import org.apache.maven.resolver.internal.ant.types.Dependency;
 import org.apache.maven.resolver.internal.ant.types.Exclusion;
@@ -86,13 +85,13 @@ public static org.eclipse.aether.graph.Dependency toDependency(
         String scope = dependency.getScope();
         return new org.eclipse.aether.graph.Dependency(
                 toArtifact(dependency, session.getArtifactTypeRegistry()),
-                ObjectUtils.isEmpty(scope) ? "compile" : scope,
+                scope == null || scope.trim().isEmpty() ? "compile" : scope,
                 false,
                 toExclusions(dependency.getExclusions(), exclusions));
     }
 
     public static org.eclipse.aether.graph.Dependency toManagedDependency(
-        Dependency dependency, List<Exclusion> exclusions, RepositorySystemSession session) {
+            Dependency dependency, List<Exclusion> exclusions, RepositorySystemSession session) {
         return new org.eclipse.aether.graph.Dependency(
                 toArtifact(dependency, session.getArtifactTypeRegistry()),
                 dependency.getScope(),