Add profiler option to SCons builds.

Add `tracy` option to `profiler`. If set, a tracy profiling client will be injected into the Godot binary.

# Conflicts:
#	platform/linuxbsd/godot_linuxbsd.cpp

platform/windows/godot_windows.cpp

@@ -30,6 +30,7 @@
 
 #include "os_windows.h"
 
+#include "core/profiling/profiling.h"
 #include "main/main.h"
 
 #include <clocale>
@@ -66,6 +67,8 @@ char *wc_to_utf8(const wchar_t *wc) {
 }
 
 int widechar_main(int argc, wchar_t **argv) {
+	godot_init_profiler();
+
 	OS_Windows os(nullptr);
 
 	setlocale(LC_CTYPE, "");