Refactor source layout

Introduce compat source sets and move all kotlin sources to the main directory

[no changelog]

src/main/kotlin/util/uuid.kt

@@ -0,0 +1,12 @@
+
+
+package moe.nea.firmament.util
+
+import java.math.BigInteger
+import java.util.UUID
+
+fun parseDashlessUUID(dashlessUuid: String): UUID {
+    val most = BigInteger(dashlessUuid.substring(0, 16), 16)
+    val least = BigInteger(dashlessUuid.substring(16, 32), 16)
+    return UUID(most.toLong(), least.toLong())
+}