Switch back to using jetbrains as the toolchain target as it can now be resolved, and also do a bit of minor gradle cleanup

Author: pupnewfster

annotation-processor/build.gradle

@@ -8,22 +8,21 @@ java.toolchain.languageVersion = JavaLanguageVersion.of("${java_version}")
 
 repositories {
     def repo = maven {
-        name 'CraftTweaker'
-        url 'https://maven.blamejared.com'
+        name = 'CraftTweaker'
+        url = 'https://maven.blamejared.com'
     }
     exclusiveContent {
         forRepositories(repo)
-        filter { InclusiveRepositoryContentDescriptor f ->
-            f.includeGroup 'com.blamejared.crafttweaker'
-            f.includeGroup 'org.openzen.zencode'
+        filter {
+            includeGroup('org.openzen.zencode')
         }
     }
     mavenCentral()
 }
 
 dependencies {
-    implementation "org.openzen.zencode:JavaAnnotations:0.3.8"
+    implementation('org.openzen.zencode:JavaAnnotations:0.3.8')
     //Version of GSON used by vanilla (and thus packed and already downloaded)
-    implementation group: 'com.google.code.gson', name: 'gson', version: '2.10.1'
-    implementation "com.squareup:javapoet:1.13.0"
+    implementation('com.google.code.gson:gson:2.10.1')
+    implementation('com.squareup:javapoet:1.13.0')
 }