fix a typo in comments
make some constants private
format: add blank lines
define widgets before routes

Maybe some constants defined in Widgets can be used to define Routes.
define modules to execute Core commands

Define modules inside Widgets through which Core commands can be executed, in particular by user requests.

Not at all sure if this is a good way to do, will need to experiment.
[views] insert <iframe>s to be used for output
fix up iframes
make "Execute" and "Description" buttons work
[CSS] make <a class='btn'> appear as button
make "Help" and "About" buttons work, WIP