this changes all api calls to respect the flags for tor and tor-port

- config now has TorPort method to return flag value if set, or default
- api now only has newClient, this creates a tor client when flag is
present. does not need to be exported anymore
- no methods take a tor argument as no longer needed
- all commands now share the same behaviour logging tor messages
- api.torClient was removed as not used anywhere
- all calls to api.newClient now check for and return the error
- api.HandlePost was removed as redundant of api.DoPost

this splits everything out into shared packages

- user config and application config share a package for now
- sync is part of the api package which includes the client, posts and
tor logic
- logging is it's own package
- commands are in their own package

first moving everything out into the base package
should be followed by some refactoring and reorganizing before creating
two different binaries for write.as and writefreely

As discussed in #20, this runs `goimports` on all Go files separating
imports into two groups: standard library and everything else.

Closes #16