Simplify index wrapper, namespacing.

Experiment with function exports.  Not quite working.

config.nims

@@ -23,12 +23,13 @@ when defined( emscripten ):
   --panics:on
   --exceptions:goto
   --define:noSignalHandler
-  --passL:"-Oz" # Production build
+  --passL:"-Oz" # Production bu ld
   # --passL:"-O0 -gDebug -gsource-map" # Debug build
-  # --passL:"-s EXPORT_NAME=Test1Module"
-  # --passL:"-s MODULARIZE=1"
+  --passL:"-s EXPORT_ES6"
+  --passL:"-s EXPORT_NAME=NimTest"
   --passL:"-s ASYNCIFY" # async support
-  # --passL:"-s JSPI" # async support
-  --passL:"-o build/index.html"
-  --passL:"--shell-file minshell.html"
+  # --passL:"-s EXPORT_ALL=1" # make all public methods available to JS
+  # --passL:"-s JSPI" # async support (new)
+  # --passL:"-s ALLOW_MEMORY_GROWTH=1"
+  --passL:"-o build/nimtest.js"