Configurable app path

[TimPietrusky]

In order to use multiple modV's together on the same computer (like modV2 and modV3), it would be nice to configure the app path, as currenlty it will always be modV.

The only solution right now is to change it directly in ./node_modules/modv-media-manager/lib/index.js#63:

  get dataPath() { //eslint-disable-line
    // Change the name "modV" to whatever you want, e.g. myawesomefolder
    return path.join(ospath.data(), 'modV');
  }

And then you have to change the options.json that is inside the modV folder (or what ever you renamed it to), to also point to the new name:

{"mediaDirectoryPath":"C:\\Users\\jonex\\AppData\\Roaming\\<myawesomefolder>\\media"}