Use esp_println in favour of the Serial peripheral wherever possible
#202
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This is kind of a dumb PR, but I'm going to be changing the interface for the Serial peripheral driver eventually anyway so these were going to need changing regardless.
The examples
hello_world,advanced_serial, andserial_interruptsexamples still use the Serial peripheral driver, as they are more or less demonstrating it. Any remaining examples were updated to useesp_println, and some had their output removed altogether when it wasn't necessary or it did not otherwise add to the example.Not really much to review here, but let me know if you have any comments.