1. Changed _e function to esc_html function.
2. Added escaping to:
adminWarning(), mediaButtonsContextFilter(), commentFormAction(), shortcodeHandler(), savePost(), displayWidget(), videopostsStep3()
2. Added escaping to:
adminWarning(), mediaButtonsContextFilter(), commentFormAction(), shortcodeHandler(), savePost(), displayWidget(), videopostsStep3()

Some are weird excaping I can't really do.