[MDL-39443] META: OU Moodle 2.4 performance tuning - Moodle Tracker

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The OU is seeing performance issues as we load-test Moodle 2.4. This meta-bug is just to collect all the separate issues we find in core code.

1.	get_string calls clean_param A LOT and that is expensive	Closed	Tim Hunt
2.	Calling clean_param(, PARAM_PLUGIN) a lot is expensive	Closed	Tim Hunt
3.	course/view.php should not require_once mod/forum/lib.php	Closed	Tim Hunt
4.	Terrible performance in the course format code	Closed	Tim Hunt
5.	html_writer::attribute has unnecessary is_array check	Closed	Sam Marshall
6.	is_siteadmin gets called repeatedly, is a bit slow	Closed	Sam Marshall
7.	cache::get_from_persist_cache could be optimised	Closed	Sam Marshall
8.	cache::parse_key: supports_multiple_identifiers check a bit slow	Closed	Sam Marshall
9.	admin_category functions test an array with is_array a lot	Closed	Andrew Lyons
10.	Theme overridden renderers are included in an inefficient way	Closed	Tim Hunt
11.	Most pages make 2 unnecessary course queries	Closed	Sam Marshall

Component watchers:: Matteo Scaramuccia, David Woloszyn, Huong Nguyen, Jake Dallimore, Meirza, Michael Hawkins, Raquel Ortega, Safat Shahin, Stevani Andolo