C#: Move signal documentation to the event

Move signal documentation from the delegate to the event and also
deprecate the event if the signal is deprecated.

modules/mono/editor/bindings_generator.cpp

@@ -2229,6 +2229,26 @@ Error BindingsGenerator::_generate_cs_signal(const BindingsGenerator::TypeInterf
 
 	// Generate signal
 	{
+		if (p_isignal.is_deprecated) {
+			if (p_isignal.deprecation_message.is_empty()) {
+				WARN_PRINT("An empty deprecation message is discouraged. Signal: '" + p_isignal.proxy_name + "'.");
+			}
+
+			p_output.append(MEMBER_BEGIN "[Obsolete(\"");
+			p_output.append(p_isignal.deprecation_message);
+			p_output.append("\")]");
+		}
+
+		String delegate_name = p_isignal.proxy_name;
+		delegate_name += "EventHandler"; // Delegate name is [SignalName]EventHandler
+
+		// Generate delegate
+		p_output.append(MEMBER_BEGIN "public delegate void ");
+		p_output.append(delegate_name);
+		p_output.append("(");
+		p_output.append(arguments_sig);
+		p_output.append(");\n");
+
 		if (p_isignal.method_doc && p_isignal.method_doc->description.size()) {
 			String xml_summary = bbcode_to_xml(fix_doc_description(p_isignal.method_doc->description), &p_itype);
 			Vector<String> summary_lines = xml_summary.length() ? xml_summary.split("\n") : Vector<String>();
@@ -2247,25 +2267,11 @@ Error BindingsGenerator::_generate_cs_signal(const BindingsGenerator::TypeInterf
 		}
 
 		if (p_isignal.is_deprecated) {
-			if (p_isignal.deprecation_message.is_empty()) {
-				WARN_PRINT("An empty deprecation message is discouraged. Signal: '" + p_isignal.proxy_name + "'.");
-			}
-
 			p_output.append(MEMBER_BEGIN "[Obsolete(\"");
 			p_output.append(p_isignal.deprecation_message);
 			p_output.append("\")]");
 		}
 
-		String delegate_name = p_isignal.proxy_name;
-		delegate_name += "EventHandler"; // Delegate name is [SignalName]EventHandler
-
-		// Generate delegate
-		p_output.append(MEMBER_BEGIN "public delegate void ");
-		p_output.append(delegate_name);
-		p_output.append("(");
-		p_output.append(arguments_sig);
-		p_output.append(");\n");
-
 		// TODO:
 		// Could we assume the StringName instance of signal name will never be freed (it's stored in ClassDB) before the managed world is unloaded?
 		// If so, we could store the pointer we get from `data_unique_pointer()` instead of allocating StringName here.