Added NSIS plugin to Gradle build create Win install executable

found this nice NSIS plugin which doesn't require local NSIS installation
allowing to implement similar function as in old Ant build
using the existing build.nsi

- task distWinInstaller
- resulting *.exe  in build/distributions

build.gradle

@@ -9,6 +9,8 @@ plugins {
   id 'distribution'
   id 'maven-publish'
   id 'com.github.johnrengelman.shadow' version '5.1.0'
+  // Load gradle-nsis plugin
+  id "com.github.langmo.gradlensis" version "0.1.0"
 }
 
 apply plugin: 'java'
@@ -420,7 +422,7 @@ task packageDistTar (type : Tar, dependsOn : ['copyDependenciesForDistribution',
 }
 
 // wrapper to create legacy distribution archives
-task packageDist (dependsOn : ['copyDependenciesForDistribution','packageDistZip','packageDistTar']) {
+task packageDist (dependsOn : ['copyDependenciesForDistribution','packageDistZip','packageDistTar'],group:'distribution') {
     // do a late copy of dependencies to dist lib directory to not interfere with standard distZip
     // which includes the lib (and bin) directory by default (task copyDependenciesForDistribution)
     // actually if copied early (e.g. in task copyFilesToDistDir) final Gradle zip/tar archive has all files double in lib dir (believe it or not)
@@ -454,4 +456,37 @@ task packagePortalsearch {
             }
         }  
     }
-}
+}
+
+// Configuration of gradle-nsis plugin.
+nsis  {
+    // path to the NSIS configuration file
+    configuration = file("${buildDir}/RELEASE/WINDOWS/build.nsi")
+    // folder where the NSIS installer generator is run. All paths 
+    // in the NSIS configuration file are relative to this folder.
+    runIn =  file("${buildDir}")
+}
+
+// prepare the NSIS build script 
+task prepNsis (type: Copy, dependsOn: ['prepYaCyProperties']) {
+    from projectDir
+    include 'build.nsi'
+    include 'gpl.txt'
+    into 'build/RELEASE/WINDOWS'
+
+    filter(org.apache.tools.ant.filters.ReplaceTokens, tokens: project.ext.filterTokens)
+    filter(ReplaceTokens, tokens: [REPL_VERSION: version])
+
+    copy {
+        from projectDir
+        include 'gpl.txt'
+        into buildDir
+    }
+}
+
+// wrapper to run prepNsis task before nsis createInstaller, to copy some config files
+task distWinInstaller (dependsOn:['copyFilesToDistDir','copyDependenciesForDistribution','prepNsis','createInstaller'], group:'distribution') {
+    tasks.findByName('createInstaller').mustRunAfter 'prepNsis'
+}
+
+