build logic cleanup

- remove jcenter
- do not use "apply plugin"
- put versions use in multiple places in variables

buildSrc/src/main/groovy/ros3rag.java-jastadd-conventions.gradle

@@ -2,6 +2,7 @@ plugins {
   id 'ros3rag.java-common-conventions'
   id 'java-library'
   id 'idea'
+  id 'org.jastadd'
 }
 
 dependencies {

gradle.properties

 jackson_version = 2.12.3
 jupiter_version = 5.8.0-M1
 assertj_version = 3.19.0
-apache_httpcomponents_version = 4.5.8
 log4j_version = 2.14.1
 protobuf_version = 4.0.0-rc-2
+protobuf_plugin_version = 0.8.16
+jastadd_gradle_version = 1.13.3

ros3rag.common/build.gradle

 buildscript {
-    repositories.jcenter()
+    repositories.mavenCentral()
     dependencies {
-        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.16'
+        classpath "com.google.protobuf:protobuf-gradle-plugin:${protobuf_plugin_version}"
     }
 }
 
 plugins {
     id 'ros3rag.java-application-conventions'
     id 'java-library'
+    id "com.google.protobuf" version "${protobuf_plugin_version}"
 }
 
-apply plugin: 'com.google.protobuf'
-
 dependencies {
     implementation group: 'com.fasterxml.jackson.dataformat', name: 'jackson-dataformat-yaml', version: "${jackson_version}"
     api group: 'com.google.protobuf', name: 'protobuf-java', version: "${protobuf_version}"

ros3rag.common/src/main/resources/tasks.gradle

 
-apply plugin: 'jastadd'
-
 dependencies {
 //    jastadd2 "org.jastadd:jastadd:2.3.5"
     jastadd2 fileTree(include: ['jastadd2.jar'], dir: '../libs')

ros3rag.placeA/build.gradle

 buildscript {
     repositories.mavenCentral()
     dependencies {
-        classpath group: 'org.jastadd', name: 'jastaddgradle', version: '1.13.3'
+        classpath group: 'org.jastadd', name: 'jastaddgradle', version: "${jastadd_gradle_version}"
     }
 }
 

ros3rag.placeB/build.gradle

@@ -2,7 +2,7 @@ buildscript {
     repositories.mavenLocal()
     repositories.mavenCentral()
     dependencies {
-        classpath group: 'org.jastadd', name: 'jastaddgradle', version: '1.13.3'
+        classpath group: 'org.jastadd', name: 'jastaddgradle', version: "${jastadd_gradle_version}"
     }
 }
 

settings.gradle

+pluginManagement {
+    plugins {
+        id 'org.jastadd' version "${jastadd_gradle_version}"
+    }
+}
+
 rootProject.name = 'ros3rag'
 
 include 'ros3rag.placeA'
 include 'ros3rag.placeB'
 include 'ros3rag.common'
-
-// include 'ros3rag.senderstub'
-// include 'ros3rag.receiverstub'