create "merged" platform

platforms/merged/build.gradle.kts

@@ -0,0 +1,39 @@
+import java.lang.IllegalArgumentException
+
+val platformOverrides = mapOf(
+        "fabric" to "remapJar"
+)
+
+dependencies {
+    "shadedApi"(project(":common:implementation"))
+}
+
+val taskSet = HashSet<AbstractArchiveTask>()
+val resourcesDir = File("${project.buildDir}/resources/main/")
+
+val dump = tasks.create("dumpDependents") {
+    doFirst {
+        taskSet.forEach {
+            val resource = File(resourcesDir, it.archiveFileName.get())
+            println("Including archive " + it.archiveFileName.orNull + " in directory " + resource.absolutePath)
+            it.archiveFile.get().asFile.copyTo(resource, true)
+        }
+    }
+}
+
+tasks["processResources"].dependsOn(dump)
+
+afterEvaluate {
+    project(":platforms").subprojects.forEach {
+        if(it == this@afterEvaluate) return@forEach
+
+        val taskName = platformOverrides.getOrDefault(it.name, "jar")
+        val task = it.tasks.named(taskName).get()
+        if(task !is AbstractArchiveTask) {
+            throw IllegalArgumentException("Task dependency must be Archive Task: " + task.name)
+        }
+        tasks["dumpDependents"].dependsOn(task)
+        taskSet.add(task)
+        println("Merged JAR will incorporate task ${task.name} from platform ${it.name}.")
+    }
+}