Author: Andrew Nicols
MDL-76867 core: Add plugin management page
http://git.moodle.org/gw?p=moodle.git;a=commit;h=51cfde0d3f0bb4e42f830cdfa40066a096e26c85
http://github.com/moodle/moodle/commit/51cfde0d3f0bb4e42f830cdfa40066a096e26c85
+ 4.2 en [disableplugin,core_admin]
+ 4.2 en [enableplugin,core_admin]