This was set to default 'template/' to append template/ to all the paths,
but every location was actually just setting it to '' to not append anything.
So removed the option entirely (additional paths can be appended to the paths
being sent to the function already)
PHPBB3-11628
This was basically duplicating functionality. $names would be used if not
empty, else array($name) would be used. Merged functionality into the first
argument
PHPBB3-11628
This was probably necessary all along, and the test happened to work
because state was not correctly reset between test runs and
a previous test set an empty template path.
PHPBB3-10933
A new method to handle this type of path was added and
compile_tag_include, compile_tag_include_php and
compile_tag_include_js were modified to use it appropriately.
Tests were added for these three macros also.
PHPBB3-10970
The template stream filter no longer depends on the $config global.
Instead it uses a 'allow_php' param that is passed via
stream_bucket_append's last argument.
Tests also adjusted.
PHPBB3-9726
