MDL-39474 introduce $CFG->debugdeveloper and cleanup $CFG init

lib/outputrequirementslib.php

@@ -224,7 +224,7 @@ class page_requirements_manager {
         ));
 
         // Set some more loader options applying to groups too.
-        if (debugging('', DEBUG_DEVELOPER)) {
+        if ($CFG->debugdeveloper) {
             // When debugging is enabled, we want to load the non-minified (RAW) versions of YUI library modules rather
             // than the DEBUG versions as these generally generate too much logging for our purposes.
             // However we do want the DEBUG versions of our Moodle-specific modules.
@@ -270,7 +270,7 @@ class page_requirements_manager {
             'jsrev'               => ((empty($CFG->cachejs) or empty($CFG->jsrev)) ? -1 : $CFG->jsrev),
             'svgicons'            => $page->theme->use_svg_icons()
         );
-        if (debugging('', DEBUG_DEVELOPER)) {
+        if ($CFG->debugdeveloper) {
             $this->M_cfg['developerdebug'] = true;
         }
 
@@ -436,7 +436,7 @@ class page_requirements_manager {
         $this->jqueryplugins[$plugin]->urls      = array();
 
         foreach ($plugins[$plugin]['files'] as $file) {
-            if (debugging('', DEBUG_DEVELOPER)) {
+            if ($CFG->debugdeveloper) {
                 if (!file_exists("$componentdir/jquery/$file")) {
                     debugging("Invalid file '$file' specified in jQuery plugin '$plugin' in component '$component'");
                     continue;
@@ -746,7 +746,7 @@ class page_requirements_manager {
 
         // Don't load this module if we already have, no need to!
         if ($this->js_module_loaded($module['name'])) {
-            if (debugging('', DEBUG_DEVELOPER)) {
+            if ($CFG->debugdeveloper) {
                 $this->debug_moduleloadstacktraces[$module['name']][] = format_backtrace(debug_backtrace());
             }
             return;
@@ -780,7 +780,7 @@ class page_requirements_manager {
         } else {
             $this->YUI_config->add_module_config($module['name'], $module);
         }
-        if (debugging('', DEBUG_DEVELOPER)) {
+        if ($CFG->debugdeveloper) {
             if (!array_key_exists($module['name'], $this->debug_moduleloadstacktraces)) {
                 $this->debug_moduleloadstacktraces[$module['name']] = array();
             }