Hide internal settings from the classref

Default actions are no longer internal since we want to document them.
They are still hidden from the Project Setting dialog because we hid the
whole `input/` group manually.

(cherry picked from commit 1e0b8d6240314f1904df560cdab840771ef3e002)

core/config/project_settings.cpp

@@ -401,6 +401,10 @@ void ProjectSettings::_get_property_list(List<PropertyInfo> *p_list) const {
 			vc.flags = PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_STORAGE;
 		}
 
+		if (v->internal) {
+			vc.flags |= PROPERTY_USAGE_INTERNAL;
+		}
+
 		if (v->basic) {
 			vc.flags |= PROPERTY_USAGE_EDITOR_BASIC_SETTING;
 		}
@@ -1242,7 +1246,7 @@ void ProjectSettings::_add_builtin_input_map() {
 			action["events"] = events;
 
 			String action_name = "input/" + E.key;
-			GLOBAL_DEF_INTERNAL(action_name, action);
+			GLOBAL_DEF(action_name, action);
 			input_presets.push_back(action_name);
 		}
 	}

doc/classes/@GlobalScope.xml

@@ -2773,6 +2773,7 @@
 			The property is shown in the [EditorInspector] (default).
 		</constant>
 		<constant name="PROPERTY_USAGE_INTERNAL" value="8" enum="PropertyUsageFlags" is_bitfield="true">
+			The property is excluded from the class reference.
 		</constant>
 		<constant name="PROPERTY_USAGE_CHECKABLE" value="16" enum="PropertyUsageFlags" is_bitfield="true">
 			The property can be checked in the [EditorInspector].

doc/classes/ProjectSettings.xml

@@ -248,9 +248,6 @@
 		<member name="application/config/description" type="String" setter="" getter="" default="&quot;&quot;">
 			The project's description, displayed as a tooltip in the Project Manager when hovering the project.
 		</member>
-		<member name="application/config/features" type="PackedStringArray" setter="" getter="">
-			List of internal features associated with the project, like [code]Double Precision[/code] or [code]C#[/code]. Not to be confused with feature tags.
-		</member>
 		<member name="application/config/icon" type="String" setter="" getter="" default="&quot;&quot;">
 			Icon used for the project, set when project loads. Exporters will also use this icon when possible.
 		</member>
@@ -1164,12 +1161,6 @@
 		<member name="internationalization/locale/test" type="String" setter="" getter="" default="&quot;&quot;">
 			If non-empty, this locale will be used when running the project from the editor.
 		</member>
-		<member name="internationalization/locale/translation_remaps" type="PackedStringArray" setter="" getter="">
-			Locale-dependent resource remaps. Edit them in the "Localization" tab of Project Settings editor.
-		</member>
-		<member name="internationalization/locale/translations" type="PackedStringArray" setter="" getter="">
-			List of translation files available in the project. Edit them in the "Localization" tab of Project Settings editor.
-		</member>
 		<member name="internationalization/pseudolocalization/double_vowels" type="bool" setter="" getter="" default="false">
 			Double vowels in strings during pseudolocalization to simulate the lengthening of text due to localization.
 		</member>