generating version number on build

src/net/torvald/terrarum/Prebuild.kt

@@ -0,0 +1,14 @@
+package net.torvald.terrarum
+
+import java.io.File
+
+/**
+ * Created by minjaesong on 2023-08-25.
+ */
+
+fun main() {
+    val s = App.getVERSION_STRING()
+    val f = File("./out/build_version_string.autogen")
+    f.delete()
+    f.writeText(s)
+}