Signals: Manually port most of remaining connect_compat uses

It's tedious work...

Some can't be ported as they depend on private or protected methods
of different classes, which is not supported by callable_mp (even if
it's a class inherited by the current one).

modules/visual_script/visual_script.cpp

@@ -30,14 +30,14 @@
 
 #include "visual_script.h"
 
-#include <stdint.h>
-
 #include "core/core_string_names.h"
 #include "core/os/os.h"
 #include "core/project_settings.h"
 #include "scene/main/node.h"
 #include "visual_script_nodes.h"
 
+#include <stdint.h>
+
 //used by editor, this is not really saved
 void VisualScriptNode::set_breakpoint(bool p_breakpoint) {
 	breakpoint = p_breakpoint;