build: Update Gradle and plugins, small cleanup to build scripts

build-logic/src/main/kotlin/Versions.kt

@@ -0,0 +1,36 @@
+object Versions {
+    const val checkerQual = "3.9.1"
+    const val geantyref = "1.3.11"
+    const val errorprone = "2.5.1"
+
+    // INTEGRATION DEPENDENCIES
+    const val guice = "4.2.3"
+
+    // DISCORD DEPENDENCIES
+    const val javacord = "3.1.1"
+    const val jda = "4.2.1_257"
+
+    // MINECRAFT DEPENDENCIES
+    const val brigadier = "1.0.17"
+    const val bukkit = "1.13.2-R0.1-SNAPSHOT"
+    const val commodore = "1.10"
+    const val bungeecord = "1.8-SNAPSHOT"
+    const val cloudburst = "1.0.0-SNAPSHOT"
+    const val adventureApi = "4.7.0"
+    const val adventurePlatform = "4.0.0-SNAPSHOT"
+    const val paperApi = "1.15.2-R0.1-SNAPSHOT"
+    const val velocityApi = "1.1.0"
+    const val spongeApi7 = "7.3.0"
+    const val jetbrainsAnnotations = "20.1.0"
+    const val guava = "21.0-jre"
+    const val fabricLoader = "0.11.1"
+    const val fabricMc = "1.16.5"
+    const val fabricApi = "0.31.0+1.16"
+
+    // IRC DEPENDENCIES
+    const val pircbotx = "83a4c22e80"
+
+    // TEST DEPENDENCIES
+    const val jupiterEngine = "5.7.0"
+    const val jmh = "1.27"
+}