Replace png with vectorized icons

.gitignore

@@ -6,3 +6,4 @@ pom.xml.versionsBackup
 pom.xml.releaseBackup
 release.properties
 .DS_Store
+.idea/

src/main/java/io/jenkins/plugins/forensics/miner/ForensicsJobAction.java

@@ -25,7 +25,7 @@
  * @author Ullrich Hafner
  */
 public class ForensicsJobAction extends AsyncConfigurableTrendJobAction<ForensicsBuildAction> {
-    static final String SMALL_ICON = "/plugin/forensics-api/icons/forensics-24x24.png";
+    static final String SMALL_ICON = "/plugin/forensics-api/icons/forensics.svg";
     static final String FORENSICS_ID = "forensics";
     private static final JacksonFacade JACKSON_FACADE = new JacksonFacade();
 

src/main/resources/io/jenkins/plugins/forensics/miner/CommitStatisticsBuildAction/summary.jelly

@@ -1,7 +1,7 @@
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:t="/lib/hudson">
 
-  <t:summary icon="/plugin/forensics-api/icons/diff-stat-48x48.png">
+  <t:summary icon="/plugin/forensics-api/icons/diff-stat.svg">
     ${%title}: ${it.scmKey}
     <j:set var="s" value="${it.commitStatistics}"/>
     <ul>

src/main/resources/io/jenkins/plugins/forensics/miner/ForensicsBuildAction/summary.jelly

@@ -1,7 +1,7 @@
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:t="/lib/hudson">
 
-  <t:summary icon="/plugin/forensics-api/icons/forensics-48x48.png">
+  <t:summary icon="/plugin/forensics-api/icons/forensics.svg">
     ${%title}: ${it.scmKey}
     <j:set var="s" value="${it.result.latestStatistics}" />
     <ul>

src/main/resources/io/jenkins/plugins/forensics/reference/ReferenceBuild/summary.jelly

@@ -1,7 +1,7 @@
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:t="/lib/hudson">
 
-  <t:summary icon="/plugin/forensics-api/icons/crosshair-48x48.png">
+  <t:summary icon="/plugin/forensics-api/icons/crosshair.svg">
 
       <j:choose>
         <j:when test="${it.hasReferenceBuild()}">