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

common/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'java-library'
+    id 'dg-java-conventions'
 }
 
 dependencies {
@@ -7,13 +7,3 @@ dependencies {
     implementation 'io.github.classgraph:classgraph:4.8.172'
     implementation "net.lenni0451:Reflect:1.3.3"
 }
-
-tasks.withType(JavaCompile).configureEach {
-    it.options.encoding = "UTF-8"
-}
-
-java {
-    toolchain {
-        languageVersion.set(JavaLanguageVersion.of(21))
-    }
-}