Make prepareLikesContext() to be able to handle external requests such as SSI.php examples.

Signed-off-by: Suki <suki@missallsunday.com>
Apply the general likes setting for Display.php

Signed-off-by: Suki <suki@missallsunday.com>
Move prepareLikesContext() to Subs.php to make it more generic and accesible for external mods/scripts.

Signed-off-by: Suki <suki@missallsunday.com>
Apply likes to ssi_queryPosts()

Signed-off-by: Suki <suki@missallsunday.com>