Adding a provider page and menu
* Add categories to html search bar
* Require provider handler and object classes
* Fetch provider code objects from registry
* Add function to generate the provider list
* Fetch providers from registry in monkey patches
* Add provider templates
* Add provider code object
* Add provider handler
* Add erb file to populate the provider list
* Don't emit type information for providers in html
* Add tests for provider handler
Refactor heredoc:
* Remove heredoc annotations
* Move heredoc functions into a heredoc helper
* Add heredoc helper class
Due to the changes in PUP-3900 which renamed Puppetx to PuppetX
and puppetx to puppet_x, strings was failing since the namespace
had not been updated in strings. In order to be compatible with this
change, update strings by renaming the namespace to match.
In order to ensure strings is still compatible with earlier versions
of puppet that don't include the namespace change, declare our own
PuppetX module. This way, if it is an older version and the namespace
is called Puppetx, the necessary PuppetX namespace will be created.