Move accounts to separate package

[divan]

This PR moves status accounts related code into separate package.

[themue]

Mostly looks reasonable. Only two comments. Also would like proper punctuation in all comments. Currently some have, others not.

[themue]

Why this renaming?

[themue]

Is the Manager implementing a public interface (and only that)? In this case the implementation should be private and the constructor function (NewManager()) simply should return the interface.

[divan]

It's renamed because now it's in separate package with name accounts. So it's a common practice to avoid names with reduntant words like rpc.RPCMessage or account.AccountManager.

So after moving this code into separate package, we have two options to use this type:
Without renaming: account.AccountManager
With: account.Manager

I think go lint can spot such naming patterns and complain as well.

[themue]

Ah, yes. So it's indeed better.

[divan]

Also would like proper punctuation in all comments. Currently some have, others not.

Oh, right. I sometimes use editor to write commit messages, and sometimes just plain command line, and adding dot is almost automatic when using editor. Thanks for bringing attention to it!

[themue]

Regarding punctuation I mostly looked at comments inside the code. So e.g. some functions/methods have a trailing dot, others not. I simply orient at the way Google does it. Here all comments are simply proper English.

[adambabik]

Changing account to acc might introduce some confusion what acc stands for. I don't have a better idea, though :P

[themue]

Good comment, struggled at acc too. Abbreviation would be acct, see http://writingexplained.org/english-abbreviations/account. Another way could be a prefix showing where the account comes from: addressedAccount (ok, it's quite long).

[divan]

@themue @adambabik thanks, changed to acct.