Core library and Better name mangling for files

code/sub/test.odin

@@ -0,0 +1,5 @@
+#import "fmt.odin" as fmt
+
+thing :: proc() {
+	fmt.println("Sub Hello!")
+}

code/test.odin

@@ -0,0 +1,5 @@
+#import "fmt.odin" as fmt
+
+thing :: proc() {
+	fmt.println("Hello!")
+}