* move kv helpers to helpers_kv*.go
* change KVGetJSON return signature
Return a boolean and an error, to clearly indicate if no value was found and thus no value unmarshalled into the target interface.
Also fix an issue with CompareAndSet to allow an oldValue of nil (i.e.
expected to be unset).
* add missing license
* tweak documentation
* document KVSetWithExpiryJSON minimum version
* Add KV helper methods to Helpers interface
* Address code-review comments, add unit tests
* Update documentation for KVCompareAndSetJSON.
* Update assertions for helpers_bots_test.go
* Fix assertion not called name in test.
* Adding EnsureBot plugin helper.
* Removing unessisary GetBot call.
* Moving to own file and error handling cleanup.
* Removing patch functionaliy. Plugins should manage their own bot account updates for now.
* Adding tests and cleaning up errors.
* Modify to not shadow err.
* Moving helpers to seperate interface.
* Feedback fixes
