add changeable config path

util/env.c

@@ -0,0 +1,11 @@
+#include "env.h"
+
+const wchar_t* get_config_path() {
+    static wchar_t path[MAX_PATH];
+    if (!GetEnvironmentVariableW(L"SEGATOOLS_CONFIG_PATH", path, MAX_PATH))
+    {
+        return L".\\segatools.ini";
+    }
+
+    return path;
+}