build: split up into multiple projects, use kotlin DLS

compilation/build.gradle.kts

@@ -0,0 +1,22 @@
+plugins {
+	id("common-java");
+}
+
+description = "A compiler of EcmaScript 5 code to J2S bytecode";
+
+tasks.processResources {
+	filesMatching("metadata.json", {
+		expand(
+			"version" to properties["project_version"],
+			"name" to properties["project_name"],
+		);
+	});
+}
+
+tasks.test {
+	useJUnitPlatform();
+}
+
+dependencies {
+	implementation(project(":common"));
+}