[common] debug: add color support to debug messages

People often miss the warnings about invalid arguments in their command
line, this last minute patch attempts to address this by making
warnings, errors, fixme's and fatal errors stand out if stdout is a TTY.

host/platform/Windows/src/platform.c

@@ -314,6 +314,9 @@ fail:
 
 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
 {
+  // initialize for DEBUG_* macros
+  debug_init();
+
   // convert the command line to the standard argc and argv
   LPWSTR * wargv = CommandLineToArgvW(GetCommandLineW(), &app.argc);
   app.argv = malloc(sizeof(char *) * app.argc);