[feature/editor-code-tabs] Apply code editor to everything

Move code editor from prosilver to assets
Apply code editor to subsilver2
Apply code editor to ACP elements where bbcode is allowed

PHPBB3-11557

phpBB/styles/subsilver2/template/editor.js

@@ -38,6 +38,7 @@ function initInsertions() {
 	}
 
 	var textarea = doc.forms[form_name].elements[text_name];
+	phpbb.applyCodeEditor(textarea);
 
 	if (is_ie && typeof(baseHeight) !== 'number') {
 		textarea.focus();