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

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

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+abstract class CloudExampleExtension {
+}

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

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+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"
+}

build-logic/src/main/kotlin/cloud.base-conventions.gradle.kts

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+import net.kyori.indra.repository.sonatypeSnapshots
+import net.ltgt.gradle.errorprone.errorprone
+import org.cadixdev.gradle.licenser.header.HeaderStyle
+
+plugins {
+    id("net.kyori.indra")
+    id("net.kyori.indra.publishing")
+    id("net.kyori.indra.checkstyle")
+    id("net.kyori.indra.license-header")
+    id("net.ltgt.errorprone")
+}
+
+indra {
+    publishSnapshotsTo("incendo", "https://repo.incendo.org/content/repositories/snapshots/")
+
+    github("Incendo", "cloud") {
+        ci(true)
+    }
+    mitLicense()
+
+    javaVersions {
+        testWith(8, 11, 16)
+    }
+
+    checkstyle("8.39")
+
+    configurePublications {
+        pom {
+            developers {
+                developer {
+                    id.set("Sauilitired")
+                    name.set("Alexander Söderberg")
+                    url.set("https://alexander-soderberg.com")
+                    email.set("contact@alexander-soderberg.com")
+                }
+            }
+        }
+    }
+}
+
+/* Disable checkstyle on tests */
+project.gradle.startParameter.excludedTaskNames.add("checkstyleTest")
+
+tasks {
+    withType<JavaCompile> {
+        options.errorprone {
+            /* These are just annoying */
+            disable(
+                    "JdkObsolete",
+                    "FutureReturnValueIgnored",
+                    "ImmutableEnumChecker",
+                    "StringSplitter",
+                    "EqualsGetClass",
+                    "CatchAndPrintStackTrace"
+            )
+        }
+        options.compilerArgs.addAll(listOf("-Xlint:-processing", "-Werror"))
+    }
+}
+
+license {
+    header(rootProject.file("HEADER"))
+    style["java"] = HeaderStyle.DOUBLE_SLASH.format
+    style["kt"] = HeaderStyle.DOUBLE_SLASH.format
+}
+
+repositories {
+    mavenCentral()
+    sonatypeSnapshots()
+    /* Velocity, used for cloud-velocity */
+    maven("https://nexus.velocitypowered.com/repository/velocity-artifacts-release/") {
+        mavenContent { releasesOnly() }
+    }
+    /* The Minecraft repository, used for cloud-brigadier */
+    maven("https://libraries.minecraft.net/") {
+        mavenContent { releasesOnly() }
+    }
+    /* The current Sponge repository */
+    maven("https://repo-new.spongepowered.org/repository/maven-public/")
+    /* The Spigot repository, used for cloud-bukkit */
+    maven("https://hub.spigotmc.org/nexus/content/repositories/snapshots/") {
+        mavenContent { snapshotsOnly() }
+    }
+    /* The paper repository, used for cloud-paper */
+    maven("https://papermc.io/repo/repository/maven-public/")
+    /* The NukkitX repository, used for cloud-cloudburst */
+    maven("https://repo.nukkitx.com/maven-snapshots") {
+        mavenContent { snapshotsOnly() }
+    }
+    /* JitPack, used for random dependencies */
+    maven("https://jitpack.io") {
+        content { includeGroupByRegex("com\\.github\\..*") }
+    }
+    /* JDA's maven repository for cloud-jda */
+    maven("https://m2.dv8tion.net/releases")
+}
+
+dependencies {
+    compileOnlyApi("org.checkerframework", "checker-qual", Versions.checkerQual)
+    testImplementation("org.junit.jupiter", "junit-jupiter-engine", Versions.jupiterEngine)
+    errorprone("com.google.errorprone", "error_prone_core", Versions.errorprone)
+    compileOnlyApi("com.google.errorprone", "error_prone_annotations", Versions.errorprone)
+}

build-logic/src/main/kotlin/cloud.example-conventions.gradle.kts

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+plugins {
+    id("cloud.base-conventions")
+}
+
+extensions.create<CloudExampleExtension>("cloudExample")
+
+// Only compile examples on CI, or when the compile-examples property exists
+if (!ci.get() && !compileExamples) {
+    tasks.configureEach {
+        onlyIf { false }
+    }
+}

build-logic/src/main/kotlin/cloud.parent-build-logic.gradle.kts

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+plugins {
+    id("net.kyori.indra.publishing.sonatype")
+}
+
+System.getenv("SNAPSHOT_PUBLISHING_USERNAME")?.run {
+    setProperty("incendoUsername", this)
+}
+System.getenv("SNAPSHOT_PUBLISHING_PASSWORD")?.run {
+    setProperty("incendoPassword", this)
+}

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

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+import org.gradle.api.Project
+import org.gradle.api.provider.Provider
+
+// set by GitHub Actions
+val Project.ci: Provider<Boolean>
+    get() = providers.environmentVariable("CI")
+            .forUseAtConfigurationTime()
+            .map { it.toBoolean() }
+            .orElse(false)
+
+val Project.compileExamples: Boolean
+    get() = hasProperty("compile-examples")