Add colors to logging

This includes the bold as well.

INFO is just default, WARN is yellow, ERROR is red.

We try to automatically detect if the output is a TTY (and thus supports
colors), and don't emit colors if so. Windows 10 supports ANSI color
codes starting with a specific build, but we don't care to emit whatever
garbage Microsoft invented for builds older than that.

desktop_version/src/main.cpp

@@ -361,6 +361,8 @@ int main(int argc, char *argv[])
     char* baseDir = NULL;
     char* assetsPath = NULL;
 
+    vlog_init();
+
     for (int i = 1; i < argc; ++i)
     {
 #define ARG(name) (SDL_strcmp(argv[i], name) == 0)