Initial reorg.

This is largely the same as #305, but updated for the current tree.

crates/misc/py/examples/two_modules/two.wat

@@ -0,0 +1,11 @@
+(module
+  (import "one" "memory" (memory $memory 0))
+  (import "one" "bar" (func $bar (result i32)))
+  (export "ask" (func $foo))
+
+  (func $foo (result i32)
+    call $bar
+    ;; Deference returned pointer to the value from imported memory
+    i32.load
+  )
+)