One calculator demo is more than enough

Removing the archetype. Enough to have a shared one at https://github.com/jtulach/html4j-archetype

Launching the application from a fully built distrution directory structure

Directly derive the parent root folder based on resource name rather than going through classpath

Lowering number of actions in invoker by half

Reference cons__V as string

External classes are treated as exported.

Make sure Object is always available in each VM and each extension.

All classes loaded through the 'vm' object will have 'invoke' method that can be used to invoke static methods like main(String[]), so our examples no longer need to rely on initialization in static initializers.

Load scripts asynchronously