Make local- and remotePath optional and additionalPaths as full alternative solution

[Creepios]

As an addition to #10 remove need of local- and remotePath and create a "paths" input with full json string, E.g.

[
  {
    "localPath": "./file.one",
    "remotePath": "./remotefile.one"
  },
  {
    "localPath": "./file.two",
    "remotePath": "./remotefile.two"
  }
]

Possible use case: Upload the same local file to multiple remote locations. With the current implementation of "additionalPaths", this wouldn't been possible