configure gradle build and java toolchain

.gitignore

@@ -1,51 +1,43 @@
-# Compiled class files
-*.class
+### Gradle ###
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
 
-# Log files
-*.log
+### Hytale ###
+run/
 
-# BlueJ files
-*.ctxt
-
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
-
-# Package Files #
-*.jar
-*.war
-*.ear
-
-# Maven target folder
-/target/
-
-# Gradle build folder
-/build/
-
-# Eclipse
-.classpath
-.project
-.settings/
-bin/
-
-# IntelliJ IDEA
+### IntelliJ IDEA ###
 .idea/
-*.iml
 *.iws
+*.iml
+*.ipr
 out/
+!**/src/main/**/out/
+!**/src/test/**/out/
 
-# VS Code
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
 .vscode/
 
-# NetBeans
-nbproject/private/
-build/
-nbbuild/
-dist/
-nbdist/
-.nb-gradle/
-
-# Mac
-.DS_Store
-
-# Linux
-*~
+### Mac OS ###
+.DS_Store