Set up maven-publish plugin

Plan/build.gradle

@@ -14,6 +14,19 @@ allprojects {
     group "com.djrapitops"
     version "4.6.2-SNAPSHOT"
 
+    configurations {
+        annotationProcessor
+        testAnnotationProcessor
+    }
+
+    compileJava {
+        options.annotationProcessorPath = configurations.annotationProcessor
+    }
+
+    compileTestJava {
+        options.annotationProcessorPath = configurations.testAnnotationProcessor
+    }
+
     test {
 //        useJUnitPlatform()
         testLogging {
@@ -31,7 +44,7 @@ allprojects {
 subprojects {
     // Build plugins
     apply plugin: "java"
-    apply plugin: "maven"
+    apply plugin: "maven-publish"
     apply plugin: "net.ltgt.apt"      // Annotation processing plugin
     apply plugin: "net.ltgt.apt-idea" // Annotation processing IntelliJ IDEA configuration plugin
     apply plugin: "com.github.johnrengelman.shadow"

Plan/plugin/build.gradle

@@ -19,4 +19,16 @@ shadowJar {
     destinationDir = file("$rootDir/builds/")
     baseName = "Plan"
     classifier = null
+}
+
+publishing {
+    publications {
+        mavenJava(MavenPublication) {
+            groupId = 'com.djrapitops'
+            artifactId = 'Plan-plugin'
+            version = project.version
+
+            artifact shadowJar
+        }
+    }
 }