Improve Gradle build scripts

modules/build.gradle

@@ -0,0 +1,51 @@
+subprojects {
+    apply plugin: 'kotlin-kapt'
+
+    dependencies {
+        // compileOnly important!!! We do not want to put the api into the zip file since the main program has it already!
+        compileOnly project(':api')
+        compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+        kapt(group: 'org.pf4j', name: 'pf4j', version: "3.2.0")
+        compileOnly(group: 'org.pf4j', name: 'pf4j', version: "3.2.0") {
+            exclude group: "org.slf4j"
+        }
+        compile group: 'org.apache.commons', name: 'commons-lang3', version: '3.5'
+        testCompile group: 'junit', name: 'junit', version: '4.+'
+    }
+
+    jar {
+        manifest {
+            attributes 'Plugin-Id': "${pluginId}",
+                    'Plugin-Class': "${pluginClass}",
+                    'Plugin-Version': "${pluginVersion}",
+                    'Plugin-Provider': "${pluginProvider}",
+                    'Plugin-Dependencies': "${pluginDependencies}"
+        }
+    }
+
+    task plugin(type: Jar) {
+        archiveBaseName = "plugin-${pluginId}"
+        into('classes') {
+            with jar
+        }
+        into('lib') {
+            from configurations.compile
+        }
+        archiveExtension = 'zip'
+    }
+
+    task assemblePlugin(type: Copy) {
+        from jar
+        into pluginsDir
+    }
+}
+
+clean {
+    dependsOn subprojects.clean
+}
+
+task assemblePlugins(type: Copy) {
+    dependsOn subprojects.assemblePlugin
+}
+
+build.dependsOn assemblePlugins

modules/lang/build.gradle

@@ -1,61 +0,0 @@
-buildscript {
-    repositories {
-        mavenCentral()
-    }
-    dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.61"
-    }
-}
-
-plugins {
-    id 'java'
-    id 'org.jetbrains.kotlin.jvm'
-    id 'kotlin-kapt'
-}
-
-group 'io.bartek'
-version '1.0-SNAPSHOT'
-
-sourceCompatibility = 1.8
-
-repositories {
-    mavenCentral()
-}
-
-jar {
-    manifest {
-        attributes 'Plugin-Id': "${pluginId}",
-                'Plugin-Class': "${pluginClass}",
-                'Plugin-Version': "${pluginVersion}",
-                'Plugin-Provider': "${pluginProvider}",
-                'Plugin-Dependencies': "${pluginDependencies}"
-    }
-}
-
-task plugin(type: Jar) {
-    archiveBaseName = "plugin-${pluginId}"
-    into('classes') {
-        with jar
-    }
-    into('lib') {
-        from configurations.compile
-    }
-    archiveExtension = 'zip'
-}
-
-task assemblePlugin(type: Copy) {
-    from jar
-    into pluginsDir
-}
-
-dependencies {
-    // compileOnly important!!! We do not want to put the api into the zip file since the main program has it already!
-    compileOnly project(':api')
-    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
-    kapt(group: 'org.pf4j', name: 'pf4j', version: "3.2.0")
-    compileOnly(group: 'org.pf4j', name: 'pf4j', version: "3.2.0") {
-        exclude group: "org.slf4j"
-    }
-    compile group: 'org.apache.commons', name: 'commons-lang3', version: '3.5'
-    testCompile group: 'junit', name: 'junit', version: '4.+'
-}