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On Linux devices the SPI speed can be set using the RF24 radio(ce,cs,spi_speed); constructor. This was not properly implemented.
- Defined RF24_SPI_SPEED for all devices in RF24_config.h
- Set spi_speed var in constructor
- Use spi_speed var for spi_transactions
- Default to RF24_SPI_SPEED when using the old BCM2835 enums
- Reconfig spi_speed var as uint32_t
- Update spi drivers for RPi,SPIDEV,wiringPi and MRAA

https://github.com/nRF24/RF24/issues/508

The check for SPI_HAS_TRANSACTION needs to be done at the end of RF24_config.h so that the SPI.h file is included before attempting detection

Per https://github.com/nRF24/RF24/issues/605 remove compatibility code for new Arduino digitalWrite API (affecting megaAVR-0 chip family and tinyAVR 0-series and 1-series chips and others)

Fixed undefined behavior when calling openReadingPipe with pipe number 6

Fixed a warning emitted by the compiler about the Linux dynamic payload example
Co-authored-by: Avamander <avamander@gmail.com>

#592

Add re-define for pgm_read_ptr
See #581 #552

When running 'sudo make install -B' the configure script is re-run with
the default setttings, removing user configuration. The documentation
has been updated to fix this.

- Update News section of front page
- Update Python instructions for Python3 per #514 and #583

When creating multiple instances of SPI class using SPIDEV driver,
only the first one got initated, because spiIsInitiated was defined as
global variable. It was changed to be a private variable of SPI class.

Fixed a very old misspell and version number

Added an overload to digitalWrite to accept boolean arguments if Arduino core is relatively new, also excluded it from doxygen documentation generation.

When RF24 wasn't ran as root, it threw a very cryptic error (see https://github.com/nRF24/RF24/issues/531): `terminate called after throwing an instance of 'int'`

This commit will improve that and now it appears as: `terminate called after throwing an instance of 'std::runtime_error' what():  Process should run as root`

Cross-compiling using arm-linux-gnueabihf-gcc 7.4.0 resulted in the following error:

`sorry, unimplemented: Thumb-1 hard-float VFP ABI`

Fixed by adding `-marm` to the build parameters for RPi 1

Fixes https://github.com/nRF24/RF24/pull/562

* Improved issue templates
* Added question template
* Improved the link in CONTRIBUTING.md
* Created a common issue template
Co-authored-by: Avamander <avamander@gmail.com>

Added getARC() to get automatic retransmission count (ARC_CNT)
Co-authored-by: Georgios Karnas <kargeor@gmail.com>

Mod to run RF24 on Raspberry SPI1

Useful also to solve issue #499
Change SPI0 to SPI1 Raspberry Pi 3

Fix in RF24::getDynamicPayloadSize