Find a way to support "Moodle forms" between core and external/WS stuff

We need to find a way to support Moodle forms definitions in the app.

This is becoming something really necessary now that the app is starting to support complex functionality (like replying forum posts).

We'd need to find a way to mimic Moodle forms, supporting:

• Inline validation
• Server validation (via Web Services)
• And, of course, rendering of elements
• Before rendering, we may need new Web Services just to retrieve the form definition (elements that should be amont its default values, draft areas, etc..)

See MDL-66173 for a scenario where this would be helpful