Fixes #11625: refactor the ace editor to make it reusable.

Make the ace editor reusable and include it on the global parameters
page.

http://projects.theforeman.org/issues/11625

Fixes #11466, #11462 - Improve layout of textareas

Fixes #11168 - Provisioning templates form is showing corrrect tabs

Fixes #11010 - removed type and association tabs, placed those options in the template tab

Fixes #11035 - template preview feature

Fixes #3971 - warning shown when PXE template is edited and has hosts in build mode

Fixes #7096 - Adds STI to templates

This commit converts Ptables to be just another type of Template so it
gets the same features as ConfigTemplate. ConfigTemplate was renamed to
ProvisioningTemplate to reflect UI and the name under it's commonly known.