Add events property (appium#429)

* add GET_SESSION

* add events property, this property will get the current information of the session and get the events timings

* add method for getting session_capabilities

* update docstring

* apply isort

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Fix True/False in image settings, add boolean value in settings test (a…

…ppium#352)

* Fix True/False in image settings, add boolean value in settings test

* use is for boolean

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Add direct connect flag to be able to handle directConnectXxxxc (appi…

…um#338)

* add direct connect feature

* rmeove todo

* update readme, extract _update_command_executor

* add logger

* make log level info

* show warning if no directConnectXxxxx in dict

* tweak error message

* tweak message format

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