No kotlin multiplatform

While running the engine on multiple of Kotlin's supported platforms would
be cool, the standard library is just way too limited for our usecase. The
JVM simply has the best support and is the most suited option.
This would reap additional benefits:
- Java, Scala and Groovy interoperability
- existing Java libraries and tooling can be (re)used
- compilation using native-image may be possible under the new rewrite (which would replace the need for Kotlin/Native)

build.gradle.kts

@@ -75,13 +75,8 @@ allprojects {
         // Kotlin support
         kotlin(property("dependencyKotlinStdIdentifier") as String)
         kotlin(property("dependencyKotlinStdJavaIdentifier") as String)
-    }
-
-    kotlin.sourceSets.main {
-        dependencies {
-            implementation("${property("dependencyKotlinReflectIdentifier") as String}:${property("dependencyKotlinReflectVersion") as String}")
-            implementation("${property("dependencyKotlinDateTimeIdentifier") as String}:${property("dependencyKotlinDateTimeVersion") as String}")
-        }
+        implementation("${property("dependencyKotlinReflectIdentifier") as String}:${property("dependencyKotlinReflectVersion") as String}")
+        implementation("${property("dependencyKotlinDateTimeIdentifier") as String}:${property("dependencyKotlinDateTimeVersion") as String}")
     }
 
     // Java

gradle.properties

@@ -19,7 +19,7 @@
 # Gradle properties
 org.gradle.caching=true
 org.gradle.configureondemand=true
-org.gradle.jvmargs=-Xmx1G -Xms1G -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError -Duser.language=en -Duser.country=US -Dfile.encoding=UTF-8
+org.gradle.jvmargs=-Xmx1G -Xms1G -XX:MaxMetaspaceSize=512M -XX:+HeapDumpOnOutOfMemoryError -Duser.language=en -Duser.country=US -Dfile.encoding=UTF-8
 org.gradle.parallel=true
 org.gradle.priority=normal