MDL-65292 style: Fix all function declarations white space

This has been generated running the following Sniffs, all
them part of the Moodle's CodeSniffer standard:
- PSR12.Functions.ReturnTypeDeclaration
- PSR12.Functions.NullableTypeDeclaration
- moodle.Methods.MethodDeclarationSpacing
- Squiz.Whitespace.ScopeKeywordSpacing

All them are, exclusively, about correct spacing, so the changes
are, all them, only white space changes.

Only exceptions to the above are 3 changes what were setting the
return type in a new line, and, when that happens, the closing
parenthesis (bracket) has to go to the same line than the colon.

files/renderer.php

@@ -534,7 +534,7 @@ class core_files_renderer extends plugin_renderer_base {
      *
      * @return \stdClass $iconcontext the context for rendering license help info.
      */
-    protected function create_license_help_icon_context() : stdClass {
+    protected function create_license_help_icon_context(): stdClass {
         $licensecontext = new stdClass();
 
         $licenses = [];