Using local path on Windows

[tomusdrw]

Solves windows case of #1648
Windows users of version from master will need to move the chain data manualy from Roaming to Local.
Could also do with additional check on Windows machine (I've tested only on one VM)

@MicahZoltu Could you please verify that the location is sound now?

[coveralls]

Changes Unknown when pulling 012e7d3 on local-data into ** on master**.

[rphmeier]

this is accomplished with the dir::CHAINS_PATH already, right?

[tomusdrw]

Yes, but that's a test code I wanted to have it more explicit here.

[MicahZoltu]

My Rust is pretty weak, but if I understand this change correctly it will make it so the chain data (the bulk of the on-disk storage) will land in AppDataType::UserCache (from that third party library)? If that is the case, I believe my primary concern is addressed here. If there is a desire, debate could be had about where the right place to put the other files are, or if ProgramData should be used instead (not currently exposed in that third party library). I am definitely up for going into more depth on what is "most correct" here, but I don't want to push my luck or prevent this change from going through, since it does address the most critical problem (roaming chain data).