Fixed bit shift in demo application of using RMT peripheral. Init data array to be transmitted was off by one, as for the first iteration (i==0) the mask was 1<<8, which results in shifted RGB value in color variable
Closes https://github.com/espressif/arduino-esp32/issues/2921
* 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
