Bluedot

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* change to how callbacks are called
* added `set_when_pressed`, `set_when_released`, etc to allow callbacks to be called in their own threads.

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* minor bug fix to launch_mock_app

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* added ability to change the color, border, shape and visibility of the dot (:attr:`~BlueDot.color`, :attr:`~BlueDot.border`, :attr:`~BlueDot.square`, :attr:`~BlueDot.visible`)
* added protocol version checking
* minor threading changes in btcomm
* updates to the Blue Dot Python app
* rewrite of the mock app
* support for protocol version 1

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* fix to `wait_for_press` and `wait_for_release`
* when_client_connects and when_client_disconnects callbacks are now threaded
* The python blue dot app can now be started with the command `bluedotapp`
* new tests for `wait_for_(events)`

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* bluetooth comms tests and minor bug fix in :class:`~.btcomm.BluetoothClient`

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* massive code and docs tidy up by `Dave Jones`_