spotless (#34)

* Do not hardcode tag names and remove not needed README comment

* Remove useless dependencies

* Deduplicate build code

* Run spotless to keep codebase clean

buildSrc/src/main/kotlin/dg-java-conventions.gradle.kts

@@ -0,0 +1,37 @@
+plugins {
+    idea
+    `java-library`
+    id("io.freefair.lombok")
+    id("com.diffplug.spotless")
+}
+
+spotless {
+    java {
+        trimTrailingWhitespace()
+        indentWithSpaces(4)
+        endWithNewline()
+
+        importOrder("", "javax|java", "\\#")
+    }
+}
+
+afterEvaluate {
+    tasks.processResources {
+        filteringCharset = "UTF-8"
+
+        filesMatching("fabric.mod.json") {
+            expand("version" to rootProject.version)
+        }
+    }
+}
+
+tasks.withType<JavaCompile> {
+    options.encoding = "UTF-8"
+}
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(21))
+    }
+}
+