* core: Obtain spclient access token using login5 instead of keymaster (Fixes#1179)
* core: move solving hashcash into util
* login5: add login for mobile
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Co-authored-by: Nick Steel <nick@nsteel.co.uk>
* Remove default impl for `SessionConfig`
* Move util mod to single file
* Restore privacy of mods
* Move `fn get_credentials` to application
* Remove `extern crate` statements