Added template context API and render_getpage_norender hook. This allows variable sets to be pushed and popped from $template, so that variables in a template inclusion can be accessed and pre-processed by plugins.
# Used for testing mod_rewrite.
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) install.php?do=modrewrite_test&str=$1
</IfModule>