Force UTF-8 encoding in javac and scalac (#152)

build.gradle

@@ -160,6 +160,14 @@ java {
     }
 }
 
+tasks.withType(JavaCompile).configureEach {
+    options.encoding = "UTF-8"
+}
+
+tasks.withType(ScalaCompile).configureEach {
+    options.encoding = "UTF-8"
+}
+
 pluginManager.withPlugin('org.jetbrains.kotlin.jvm') {
     // If Kotlin is enabled in the project
     kotlin {
@@ -1014,6 +1022,7 @@ idea {
             }
             compiler.javac {
                 afterEvaluate {
+                    javacAdditionalOptions = "-encoding utf8"
                     moduleJavacAdditionalOptions = [
                         (project.name + ".main"): tasks.compileJava.options.compilerArgs.collect { '"' + it + '"' }.join(' ')
                     ]