Add template handling to REST API

We should be able through the REST API to:

• List templates
• Get a template required fields
• Use a template to create an object
• Edit/Get/Delete template like other objects

changed milestone to %FusionDirectory 1.4

added plugin-webservice label

marked the checklist item Use a template to create an object as completed

added PJ1801-0146 label

changed due date to May 28, 2019

marked the checklist item Edit/Get/Delete template like other objects as completed

Edit/Get/Delete is already possible using normal request like other objects

mentioned in issue fd#5993 (closed)

mentioned in commit 571b5365

added 2h 30m of time spent at 2019-05-28

marked the checklist item List templates as completed

mentioned in commit 10b63415

marked the checklist item Get a template required fields as completed

added To Be Tested label

added 2h of time spent at 2019-05-29

removed due date