Scripting: Add script documentation cache to project

This PR adds a script documentation cache in the project folder.
It is loaded at alongside native documentation caches. This makes
scripts fully accessible through Search Help, including their
members, etc, right from project start, without having to compile
every single script.

Co-authored-by: Hilderin <81109165+Hilderin@users.noreply.github.com>

editor/doc_tools.cpp

@@ -369,6 +369,15 @@ void DocTools::remove_doc(const String &p_class_name) {
 	class_list.erase(p_class_name);
 }
 
+void DocTools::remove_script_doc_by_path(const String &p_path) {
+	for (KeyValue<String, DocData::ClassDoc> &E : class_list) {
+		if (E.value.is_script_doc && E.value.script_path == p_path) {
+			remove_doc(E.key);
+			return;
+		}
+	}
+}
+
 bool DocTools::has_doc(const String &p_class_name) {
 	if (p_class_name.is_empty()) {
 		return false;

editor/doc_tools.h

@@ -45,6 +45,7 @@ class DocTools {
 	void merge_from(const DocTools &p_data);
 	void add_doc(const DocData::ClassDoc &p_class_doc);
 	void remove_doc(const String &p_class_name);
+	void remove_script_doc_by_path(const String &p_path);
 	bool has_doc(const String &p_class_name);
 	enum GenerateFlags {
 		GENERATE_FLAG_SKIP_BASIC_TYPES = (1 << 0),

editor/editor_file_system.cpp

@@ -2073,6 +2073,7 @@ void EditorFileSystem::_update_script_documentation() {
 
 		if (!efd || index < 0) {
 			// The file was removed
+			EditorHelp::remove_script_doc_by_path(path);
 			continue;
 		}
 
@@ -2091,7 +2092,7 @@ void EditorFileSystem::_update_script_documentation() {
 				}
 				Vector<DocData::ClassDoc> docs = scr->get_documentation();
 				for (int j = 0; j < docs.size(); j++) {
-					EditorHelp::get_doc_data()->add_doc(docs[j]);
+					EditorHelp::add_doc(docs[j]);
 					if (!first_scan) {
 						// Update the documentation in the Script Editor if it is open.
 						ScriptEditor::get_singleton()->update_doc(docs[j].name);