Introduce jquery formvalidator for com_contact ::frontend

[dgrammatiko]

Executive summary

This PR converts the form validation on com_config to use plain jquery (no mootools call on every form).
Also NO MORE INLINE SCRIPTS!

Testing

1. Apply first PR Reduce unneeded calls for mootools #4888 (!important)
2. Apply this PR
3. In the admin area create new menu items for contact (categories, category, etc)
4. go to the new menus and test that everything is still OK

If no javascript errors are logged in your browser’s console and the functionality remains the same, your test is passing in any other case please report the errors here

Please also check these:
administrator/index.php?option=com_checkin should demonstrate multiselect without mt
administrator/index.php?option=com_users&view=mail should demonstrate form sent and validate without mt
administrator/index.php?option=com_modules should demonstrate multiselect and combobox without mt
Logout and log in to demonstrate the use of noframes without mt.

[dgrammatiko]

@infograf768 can I ask for a rerun of travis here? People scared on the error message, and walk away

[infograf768]

Travis relaunched. Can you /test OK #5121 ?

[Hackwar]

@test success
Again, the tooltips are misaligned.

[anibalsanchez]

@test success

[roland-d]

Moving to RTC as we have 2 successful tests.

This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/5112.

[Bakual]

Merged into staging. Thanks!