* Add an aditional (void *) arg to the RMT callback - to allow more flexible handling of the callback (e.g. by passing a private struct or a class pointer). Same pattern as used by the Ticker() and many others. Example updated & new example with a trapoline added.
* Fix example for new API
* Fix lint warnings
* Add a second missed example.
* Correct timeout & improve socket error handling.
* rmt driver initial version
* supporting conti mode plus interrupts
* using conitnous mode for sending more data
* working continous mode
* rmt driver cleanup after conti mode
* initial version of rmt driver
* adding a simple example
* adding channel and block locks
* modified of rmt interface for simpler/easier usage
* adding header sentinels, split interface to common and additional settings
* Fixes per code review + support for rx callback mode
* renamed internal structures and enums, fixed formatting
* cmake support for rmt
* refactored tx-conti interrupts to function to make it more readable
* added Tx and Rx examples
* added license headers
* minor updates per review
* used struct access, renamed defines, corrected diagram
