Author: Jun Pataleta
MDL-53832 enrol_lti: Improve provider logic
* onRegister
- Validate returnUrl and consumer object.
- Use moodle_url for the returnURL.
- Set success message on successful registration.
- Reorganise code.
* Constructor
- Remove required params we don't need (Original sub-task: MDL-56035)
* onLaunch
- Validate consumer object.
- Set appropriate values for OK flag and message.
* Import classes.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=daebcd2801ad3e9e849ebca41c87ab826dcfee41
http://github.com/moodle/moodle/commit/daebcd2801ad3e9e849ebca41c87ab826dcfee41
+ 3.2 en [invalidtoolconsumer,enrol_lti]
+ 3.2 en [returnurlnotset,enrol_lti]