Make User tour supports the Moodle filters

Covered by newly created Behat. (MathJax and Activity names auto-linking) Manual testing steps are below Login as admin. Navigate to  Site administration > Appearance > User tours > Create a new tour. Fill in the form with below values: Name: Youtube and Equation tour Apply to URL match: /my/% Tour is enabled: Checked. Click Save changes. Verify. The new tour appears in the tours list. Disabled all tours by clicking the eye icon, so it changed to slash eye icon, except the one that you have created (Youtube and Equation tour). Click on the created Youtube and Equation tour. Click on New step link. Fill in the form with below values: Target type: Display in the middle of page Title: Test Youtube video Content type: Manual Content: https://www.youtube.com/watch?v=PEH-mkmDexc Click Save changes. Create an equation tour step by Clicking on New step link. Fill in the form with below values: Target type: Display in the middle of the page Title: Test Equation Content type: Manual Content: Click Show more buttons (level down icon) in the Atto editor Click the Equation editor icon (calculator icon) Click Advanced and then select one of the equations in the list Verify . New text inserted in the Atto editor. Click Save changes. Navigate to Dashboard. Verify that the Tour will be displayed. Verify that the titles of the Tour step is: Test Youtube video Verify that the video player will be displayed. Click the play icon. Verify that you can play the Youtube video. Click the "Next (1/2)" button. Verify that the titles of the Tour step is: Test Equation Verify that the equation is displayed correctly as expected. Navigate to Site Administration -> Plugins -> Manage media players. Disable VideoJS player and enable Youtube. Repeat the steps from 1 to 22.