Refactor source layout

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

[no changelog]

src/main/kotlin/util/LoadResource.kt

@@ -0,0 +1,20 @@
+
+package moe.nea.firmament.util
+
+import java.io.InputStream
+import kotlin.io.path.inputStream
+import kotlin.jvm.optionals.getOrNull
+import net.minecraft.util.Identifier
+import moe.nea.firmament.repo.RepoDownloadManager
+
+
+fun Identifier.openFirmamentResource(): InputStream {
+    val resource = MC.resourceManager.getResource(this).getOrNull()
+    if (resource == null) {
+        if (namespace == "neurepo")
+            return RepoDownloadManager.repoSavedLocation.resolve(path).inputStream()
+        error("Could not read resource $this")
+    }
+    return resource.inputStream
+}
+