Social media icons added to MPLITE theme
Events standardised

* MP:HEADER
* MP:FOOTER
* MP:PAGETITLE
* MP:SEOMETA
* MP:OPENGRAPH
* MP:SCRIPT
* MP:STYLESHEET
Event engine

* MP:HEADER & MP:FOOTER event response added to template
* Event test code added to plugins
Merge branch 'feature/user' into develop