Add Windows support to /modlog

By writing a batchfile for windows which is called, it isn't necessary to install additional programs on the computer. This should easily work with Windows 2k and above
And yes, Windows understands `/` except for the type command used in `winmodlog.cmd`, the use of `/` with `type` results in unexpected results. An example:

```
C:\Users\Florian\Desktop\dev\forked_server>TYPE "logs/modlog/README.md"
Pokémon Showdown
========================================================================

Navigation: [Website][1] | **Server repository** | [Client repository][2]

  [1]: http://pokemonshowdown.com/
  [2]: https://github.com/Zarel/Pokemon-Showdown-Client
[...]
```